3991 . A water tank has two taps ( Tap-1 and Tap-2) : Tap-1 can fill a tank in 8 hours and Tap-2 can empty the tank in 16 hours . How long will they take to fill the tank if both taps are opened simultaneously but Tap -2 is closed after 8 hours?

A. 10
B. 12
C. 14
D. 16

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Answer: Option B

Explanation:

In 1 hr, the tank is filled = 1/8 - 1/16 = 1/16
In 8 hrs " " " " = 8/16 = 1/2
Now,
1/8 part is filled by tap - 1 in 1 hour
1/2 part is filled by tap - 1 in = 8/2 = 4 hrs
So, the required time = 8 + 4 = 12 hrs

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Sonali- Rupali- Bangladesh Krishi- Rajshahi krishi unnayn-Investment Corporation of Bangladesh | 30.11.2018

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3992 . A watch which gains 5 seconds in 3 minutes was set right at 7am . In the afternoon of the same day when the true time is 1 pm, the watch will indicate :

A. 1:10pm
B. 12:55pm
C. 1:05pm
D. 1:08pm
E. 12:50pm

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Answer: Option A

Explanation:

The time difference = 1pm - 7 pm = 6 hour = 360 minutes

3 minute gains from 5 second

1 minute gains from 5/3 second

360 minute gains from (5×360)/3 second = 600 second = 10 minute

So, at 1 PM, the watch will indicate = 1PM + 10 minute = 1 : 10 PM

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Bangladesh Bank - Assistant Director - 2013 ||

A. 280
B. 300
C. 310
D. 320
E. 305

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Answer: Option B

Explanation:

Let, the original speed is x and 3/5 th of original speed is 0.6x

50/0.6x - 50/x = 40/60
(250 - 150)/3x = 2/3
100/3x = 2/3
6x = 300
x = 50

3/5 of 50 = 30
speed reduces by = 50 - 30 = 20
It is late by 2 hours and by this time it goes 30*2 = 60
If the train goes with its original speed it took 60/20 = 3 hours after the first hour. That means total 4 hours.
Therefore, total distance covered

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Bangladesh Bank - Assistant Director - 2011

A. 4:00
B. 5:00
C. 6:00
D. 7:00
E. 8:00

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Answer: Option B

Explanation:

6:00 in evening in Chicago = 7:00 in evening in New York. So, the train was in Chicago 7:00 in the evening, New York time.

The trip took T = D/R = 840/60 = 14 hours. Therefore, the train depart from New York at 7:00 - 14 hours = 5:00 in the morning, New York time.

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3995 . A train of length 150 m takes 10 seconds to cross another train 100 m long coming from the opposite direction . If the speed of first train is 30 km / hr, what is the speed of second train?

A. 48km /hr
B. 54 km / hr
C. 60 km / hr
D. 72 km / hr

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Answer: Option C

Explanation:

Take the speed of the second train =
x
km/hr
They will have to cover a distance = sum of the lengths of the trains ( 150 + 100 = 250 m = 0.25 km )
Obtain their relative speed( x + 30 ) km/h & find out the time taken ( 10 sec = 10/3600 hr )
Equate it to 10s and solve for
( x + 30 ) =( 0.25/ 10 ) * 3600
x = 60 km/hr

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Sonali &amp-Janata Bank | Officer (IT)| 04.01.2019

A. 8:36 am
B. 8:56am
C. 9.00 am
D. 9:24 am

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Answer: Option D

Explanation:

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Senior Officer- 8 Bank Recruitment Test 31-08-2018

A. 40 seconds
B. 42 seconds
C. 45 seconds
D. 48 seconds

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Answer: Option A

Explanation:

Hints: train অতিক্রম করে নিজের length এবং bridge এর length 45km/hr = ( 45÷3.6)ms - 1 = 12.5 ms - 1

Time = 140 + 360 /12.5 = 40seconds.

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3998 . A train 220 m long is moving at 45km/h. The time taken by the train to crosse tunned 260m long is-

A. 38.40 sec
B. 35 sec
C. 38 sec
D. 40 sec

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Answer: Option A

Explanation:

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জাতীয় নিরাপত্তা গোয়েন্দা সংস্থা-(NSI) Assistant Director- Research officer &amp- Assistant Programmer-০৮/১০/২০২১

A. 52
B. 56
C. 54
D. 58

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Answer: Option C

Explanation:

Speed of the first train = 150/15 = 10 mps.
speed of the second train = x mps.
According to the question:
x + 10 = (150 + 150)/8
x = 27.5 mps = 27.5 × 3600/1000 = 99 kmph. Ans: D

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Senior Officer- 8 Bank Recruitment Test 31-08-2018

A. 22
B. 36
C. 30
D. 26

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Answer: Option D

Explanation:

Speed of the train relative to man = (125/25) m/sec = 5 m/sec.
[5 x (18/5)] km/hr = 18 km/hr.
Let the speed of the train be 'S' km/hr.
Then, relative speed = (S - 8) km/hr.
S - 8 = 18 = > S = 26 km/hr.

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Officer (General) -Ansar VDP Unnayan | BD House Building Finance Corporation 28.09.2018

A. 10%
B. 12.5%
C. 13.6%
D. 15%

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Answer: Option B

Explanation:

Let list price is 100
Selling price (SP) at discount = 100-28 = Rs 72
Therefore Cost price = 72/90 x 100 = 80
When chair is sold for Tk. 90
profit = 90/80 x 100 - 1= 12.5%

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4002 . A total of TaKa 1200 is deposited in two savings accounts for one year, part at 5% and the remainder at 7% . If TaKa 72 was earned in interest , how much was deposited at 5% ?

A. 300
B. 500
C. 700
D. 600
E. None of them

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Answer: Option D

Explanation:

Let, Tk was deposited at 5%

so, (1200 - x) was at 7%

Total interest = 72 = . 5 × x + ( 1200 - x) ×. 07

= . 05x + 84 - . 07x

x (. 05 - . 07) = 72 - 84

x × ( - .02) = - 12

x = 12/.02 = 600

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Bangladesh Bank - Assistant Director - 2012

A. 45 munutes
B. 60 munutes
C. 75 minutes
D. 90 munutes

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Answer: Option D

Explanation:

Let the pipes fill the tank in x minutes.
Part of the tank filled by pipes A and B in one minute: 1/36
Part of the tank filled by pipe A in 1 minute = 1/36−1/x
According to the question,
30 × (1/x) + (1/36−1/x) = 1
⇒30x + 10/9−40/x = 1
⇒10/x = 1/9
Hence, x = 90 minutes.

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অফিসার (ক্যাশ ) - Sonali | Rupali | BD Krishi | Rajshahi Krishi Unnayn | Investment Corporation Of Bangladesh - ২৯. ০৩.২০১৯

A. 20%
B. 15%
C. 5%
D. 30%
E. 0%

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Answer: Option A

Explanation:

দুই আলাদা % এর থেকে common 25% বিয়োগ দিয়ে result টি হবে যা অন্তত news অথবা paper দেখে।

যারা দেখে না = 100 - ( 65 + 40 - 25) = 20%

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4005 . A sum fetches a simple interest of Tk. 6000 at the rate of 5% p.a. in 6 years . what would be the compound interest earned at the same rate of interest and the same principal in 2 years?

A. Tk. 2050
B. Tk. 2500
C. Tk. 2125
D. Tk. 2245

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Answer: Option A

Explanation:

The sum = Tk. (6000 × 100)/(5 × 6) = Tk. 20000
Compound Interest = (20000 × 105/100 × 105/100) – 20000 = Tk. 2050. Ans: A

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Officer (Cash) -Sonali Bank | BD Development | BD Krishi Bank - 12.10.2018

3991 . A water tank has two taps ( Tap-1 and Tap-2) : Tap-1 can fill a tank in 8 hours and Tap-2 can empty the tank in 16 hours . How long will they take to fill the tank if both taps are opened simultaneously but Tap -2 is closed after 8 hours?

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3992 . A watch which gains 5 seconds in 3 minutes was set right at 7am . In the afternoon of the same day when the true time is 1 pm, the watch will indicate :

3993 . A train which travels at a uniform speed due to some mechanical fault after traveling for an hour goes at 3/5th of the original speed and reached the destination 2 hours late. If the fault had occurred after traveling another 50 miles, the train would ha

3995 . A train of length 150 m takes 10 seconds to cross another train 100 m long coming from the opposite direction . If the speed of first train is 30 km / hr, what is the speed of second train?

3996 . A train leaves a station A at 7 am and reaches another station B at 11 am. Another train leas B at 8 am and reaches A at 11:30 am. The two trains cross one another at

3997 . A train 360 m long is running at a speed of 45 km/hour. In what time will pass a bridge 140 m long?

3998 . A train 220 m long is moving at 45km/h. The time taken by the train to crosse tunned 260m long is-

3999 . A train 150 m long crosses a milestone is 15 seconds and crosses another train of the same lengh travelling in the opposite direction in 12 seconds. The speed of the second train in km/hr is.

4000 . A train 125 m long passes a person , running at 8 km / hr in the same direction in which the train is going in 25 seconds . The speed of the train is :

4001 . A trader makes a loss of 10% by selling a chair at a discount of 28% on the listed price.What will be his loss/profit if he sells the chair at 90% of its listed price?

4002 . A total of TaKa 1200 is deposited in two savings accounts for one year, part at 5% and the remainder at 7% . If TaKa 72 was earned in interest , how much was deposited at 5% ?

4003 . A tank can be filled with water by two pipes A and B together in 36 minutes, the tank is filled in 40 minutes. The pipe B can alone fill the tank in -

4004 . A survey of the town Sherpur found that 70% of the people watched the news on TV, 35% of the people read the news on newspaper and watched the TV and 25% read a newspaper and watched the TV news. What percentage of the people either watched the news on TV nor read it on the newspaper?

4005 . A sum fetches a simple interest of Tk. 6000 at the rate of 5% p.a. in 6 years . what would be the compound interest earned at the same rate of interest and the same principal in 2 years?

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