151 . 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

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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152 . 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

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

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.

154 . 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

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

View Answer	Favorite Question

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

Bangladesh Bank - Assistant Director - 2011

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

Bangladesh Bank - Assistant Director - 2013 ||

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

View Answer	Favorite Question

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

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

A. 20
B. 25
C. 30
D. 35

View Answer	Favorite Question

Answer: Option C

Explanation:

Let, x eggs at 12 cents each and y eggs at 14 cents each.

1 dollar = 100 cents.

So, 12x + 14y = 660 and x + y = 50.

Solving these two, we get x = 20, y = 30.

158 . $a^{2} + b^{2} = ?$ ..

A. ${(a + b)}^{2} + 2 a b$
B. ${(a + b)}^{2} - 2 a b$
C. ${(a + b)}^{2} - 4 a b$
D. ${(a + b)}^{2} + 4 a b$

View Answer	Favorite Question

Answer: Option B

Explanation:

প্রবাসী কল্যান ব্যাংক।। অফিস সহায়ক (05-05-2023) || 2023

A. 3
B. 15
C. 5
D. 4

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Answer: Option D

Explanation:

160 . Aalm sold tow vehicles for Tk. 46000 each . If he gained 10% on the first and lost 10% on another , then what is his percentage profit or loss in this transaction ?

A. 2% loss
B. 1 % profit
C. 1 % loss
D. None of these

View Answer	Favorite Question

Answer: Option C

Explanation:

In the case where loss and gain percentage is common on same selling price, always a loss incurs in total deal. And this can be calculated by a short - cut: Loss on total deal, = (Common loss or gain percentage/10)^2 = (10/10)^2 = 1%

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

A. ∠BAD
B. ∠BCD
C. ∠CBD
D. ∠ABD
E. None of these

View Answer	Favorite Question

Answer: Option E

Explanation:

162 . After paying 10% tax on all income over Tk.3000, Rahim had a net income of tk.12000. Rahim's income before tax (in Tk) was--

A. 12900
B. 12300
C. 13300
D. 10300
E. 13000

View Answer	Favorite Question

Answer: Option E

Explanation:

12, 000 - 3, 000 = 9, 000

10% tax, if after tax income Tk.90 before tax income Tk.100

If after tax income Tk. 9000 before tax income Tk. = ( 100× 9000)/90 = 10, 000

Before tax income = 10, 000 + 3, 000 = Tk.13, 000

163 . After replacing an old member by a new member , it was found that the average age of five members of a club is the same as it was 3 years ago . What is the difference between the ages of the old and the new member ?

A. 15 year
B. 8 year
C. 4 year
D. 2 year
E. None of them

View Answer	Favorite Question

Answer: Option A

Explanation:

Age decreased = (5 × 3) years = 15 years
So, the required difference = 15 years

Bangladesh Bank - Assistant Director - 2012

A. TK.750
B. TK. 875
C. TK. 745
D. TK. 756

View Answer	Favorite Question

Answer: Option A

Explanation:

ওয়েজ আর্নার্স কল্যাণ বোর্ড || সহকারী পরিচালক (22-11-2024) || 2024

A. 2% loss
B. 1% profit
C. 1% loss
D. None of these

View Answer	Favorite Question

Answer: Option C

Explanation:

Let the profit be X% & loss be Y%.
So, net profit/loss % = X + ( - Y) + X.( - Y)/100 (Negative sign denotes that there is a loss.) = 10 + ( - 10) + 10.( - 10)/100 = - 1 (Negative sign denotes that there is a net loss.)
So, the net loss percentage is 1%.

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

151 . 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

152 . 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?

154 . 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

155 . 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 :

156 . 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?

157 . A woman buys 50 eggs for $6.60. Some cost 12 cents each and the rest 14 cents each. How many eggs has she bought at 14 cents each?

159 . a2−b2=20 ; a+b=5, what is the value of a - b ?

160 . Aalm sold tow vehicles for Tk. 46000 each . If he gained 10% on the first and lost 10% on another , then what is his percentage profit or loss in this transaction ?

161 . ABC is a right angle of an isosceles triangle ∆ABC. BD is perpendicular to AC. Which of the following if any is not a 45° angle?

162 . After paying 10% tax on all income over Tk.3000, Rahim had a net income of tk.12000. Rahim's income before tax (in Tk) was--

163 . After replacing an old member by a new member , it was found that the average age of five members of a club is the same as it was 3 years ago . What is the difference between the ages of the old and the new member ?

164 . Ahmed sold a T- shirt TK. 810 again 8%. How much did he purchase it for?

165 . Alam sold two vehicles for Tk. 46000 each . If he gained 10% on the first and lost 10% on another , then what is his percentage profit or loss in this transaction?

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