hr, find the time taken by the boat to go 68 km downstream.

A. 2 hours
B. 3 hours
C. 4 hours
D. 5 hours
E. None of these

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Answer: Option C

Explanation:

Downstream speed = speed of boat + speed of stream

= 13 km/hr + 4 km/hr

= 17 km/hr

Now, 17 km goes in 1 hour

1 km goes in 1/17 hour

68 km goes in ( 68×1)/17 hour = 4 hour

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সাবস্ক্রিপশন লিংক

692 . A boat covers 143 km upstream in 13 hours and the same distance downstream in 11 hours. What is the speed (in km / hr ) of the boat in still (without stream) water?

A. 10 km/hr
B. 12 km/hr
C. 14 km/hr
D. 8 km/hr

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Answer: Option B

Explanation:

Let the speed of the boat and speed of the stream be x km/hr and y km/hr respectively

According to the question,

143 / (x - y) = 13 - (- - - (i))

143 / (x + y) =11-***=(ii)

On comparing both eq

11(x + y) = 13(x - y)

11x + 11y = 13x - 13y

24y = 2x

x / y = 12/1
Ans: Speed of the boat in still water is 12 km/hr

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A. 2
B. 3
C. 4
D. 5

View Answer	Favorite Question

Answer: Option B

Explanation:

boat speed + steam speed = 8 km/hour

boat speed - steam speed = 2 km/hour

(Doing Subtraction), 2*(steam speed) = 6 km/hour

steam speed = 6/2 = 3 km/hour (Ans)

বিসিআইসি | সহকারী প্রকৌশলী (কমার্শিয়াল) | 10-12-2021 || 2021

A. 1/2 km/hr
B. 1 km/hr
C. 2 km/hr
D. 1.5 km/hr

View Answer	Favorite Question

Answer: Option B

Explanation:

Let,

Speed of stream = y &

Speed of boat = x

ATQ,

x - y = 24/6 = 4— (i)

x + y = 24/4 = 6 ——– (ii).

From,

(ii) – (i),

x + y - x + y = 6 - 4

Or, 2y = 2

Or, y = 1

∴ Speed of stream = 1 km/hr (ans)

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A. m/(r + 2s)
B. m/(r + s)
C. (m + r)/s
D. mr - s

View Answer	Favorite Question

Answer: Option A

Explanation:

Let the speed of the boat in still water be “x” miles/hr.

The speed of the stream is given as “s” miles/hr

Therefore,

Speed of the boat upstream = (x – s) miles/hr ….. (i)

Speed of the boat downstream = (x + s) miles/hr ……. (ii)

The distance covered by the boat while sailing upstream is given as “m” miles

Speed of the boat upstream is given as “r” miles/hr …. (iii)

From (i) & (iii), we get

x - s = r

⇒ x = r + s ….. (iv)

Substituting the value of x in eq. (iii), we get

Speed of the boat downstream = (r + s + s) miles/hr = (r + 2s) miles/hr ….. (v)

Time = distance / speed

= [m / (r + 2s)] hr

696 . A boat takes 19 hours to travel downstream from point A to point B and coming back to a point C midway . betway A and B . If the speed of the stream is 4 km/hr . what is the distance between A and B?

A. 160 km
B. 200 km
C. 180 km
D. 220 km

View Answer	Favorite Question

Answer: Option C

Explanation:

697 . A boat takes 4 hours to cover a certain distance running downstream, while it requires 8 hours 48 minutes to cover the same distance .Find the ratio between the speed of the current and the speed of the boat?

A. 1 : 2
B. 3 : 8
C. 2 : 3
D. 4 : 3

View Answer	Favorite Question

Answer: Option B

Explanation:

698 . A boat travel with a speed of 10 km/hr in still water. If the speed of the stream is 3 km/hr then find time taken by boat to travel 52 km downstream.

A. 2hrs
B. 4hrs
C. 5hrs
D. 9hrs

View Answer	Favorite Question

Answer: Option B

Explanation:

Speed downstream = (10 + 3) km/hr = 13 km/hr
Time taken to travel 52 km downstream = 52/13 hours = 4 hours

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A. 40 minutes
B. 1 hour
C. 1 hour 15 minutes
D. 1 hour 30 minutes

View Answer	Favorite Question

Answer: Option C

Explanation:

Hints: Rate down stream = 1/10 × 60 km/hr = 6km/hr

Rate up stream = 2 km/hr

speed in still water = 1/2 (6 + 2)km/hr = 4 km/hr

Required time = 5/4 hrs = 1 hrs 15 min

700 . A bond gets matured in 10 years . invested TK. 42,000 in this bond and received Tk. 105000 once the bond matured . If the bond was under simple interest . then what was the rate of interest per annum?

A. 10%
B. 12.5%
C. 15%
D. 7.5%

View Answer	Favorite Question

Answer: Option C

Explanation:

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A. 45
B. 50
C. 55
D. 60

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Answer: Option C

Explanation:

At 30% profit , cost = Tk, ( 100×65)/130 = Tk.50

Now, At 10% profit , the new selling price = Tk.(110 × 50) 100 = Tk.55

702 . A book sells for TK. 65. This price gives the seller a profit 30% on his cost. What will bi the new selling price if he cuts his profit to 10% of the costs ?

A. 55
B. 50
C. 45
D. None of these

View Answer	Favorite Question

Answer: Option A

Explanation:

Given that,

In 30% profit, Sell price = Tk 65

So, 130% = 65

= > 1% = 65÷130

= > 100% = (65×100)÷130 = 50

So, cost price = 50

New, profit percentage is 10%

In 10% profit, sell price is

50×110% = 55

Ans: 55

Bangladesh Bank - Officer - 2001

A. 926
B. 1020
C. 1026
D. 1080

View Answer	Favorite Question

Answer: Option C

Explanation:

704 . A box contains 10 electric bulbs from which 2 bulbs are defective. Two bulbs are chosen at random. What is the probability that one of them is defective?

A. 3/10
B. 25/68
C. 16/45
D. 8/33

View Answer	Favorite Question

Answer: Option C

Explanation:

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A. 1.2gm
B. 1.6gm
C. 2.75gm
D. 6.15gm

View Answer	Favorite Question

Answer: Option B

Explanation:

Let's denote the weight of the empty box as "E" grams.

Now, let's calculate the total weight of the box and its contents:

Weight of 12 poles = 12 poles * 1.1 gm/pole = 13.2 gm
Weight of 7 pieces of net = 7 pieces * 0.2 gm/piece = 1.4 gm

So, the total weight of the poles and net is 13.2 gm + 1.4 gm = 14.6 gm.

Now, we are given that the box and its contents together weigh 16.25 gm. Therefore, we can write the equation:

E (weight of the empty box) + 14.6 gm (weight of poles and net) = 16.25 gm (total weight)

Now, solve for E:

E + 14.6 gm = 16.25 gm

Subtract 14.6 gm from both sides:

E = 16.25 gm - 14.6 gm

E = 1.65 gm

So, the weight of the empty box is 1.65 grams, which is equivalent to 1.6 grams when rounded to one decimal place.

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691 . A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.

692 . A boat covers 143 km upstream in 13 hours and the same distance downstream in 11 hours. What is the speed (in km / hr ) of the boat in still (without stream) water?

693 . A boat goes 8 km in one hour along the steam and 2 km in one hour against the stream, The speed in km/hr of the stream is.

694 . A boat sailing against a stream of river takes 6 hours to travel 24 kms, while sailing with the stream it takes 4 hours to travel the same distance. What is the speed of the stream?

695 . A boat sails m miles upstream at the rate of r miles per hour. If the rate of the stream is s miles per hour, how long will it take the boat to return to its starting point?

696 . A boat takes 19 hours to travel downstream from point A to point B and coming back to a point C midway . betway A and B . If the speed of the stream is 4 km/hr . what is the distance between A and B?

697 . A boat takes 4 hours to cover a certain distance running downstream, while it requires 8 hours 48 minutes to cover the same distance .Find the ratio between the speed of the current and the speed of the boat?

698 . A boat travel with a speed of 10 km/hr in still water. If the speed of the stream is 3 km/hr then find time taken by boat to travel 52 km downstream.

699 . A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current in 10 minutes. How long will it take to go 5 km in stationary water ?

700 . A bond gets matured in 10 years . invested TK. 42,000 in this bond and received Tk. 105000 once the bond matured . If the bond was under simple interest . then what was the rate of interest per annum?

701 . A book sells for TK. 65. This price gives the seller a profit of 30% on his cost. What will be the new selling price if he cuts his profit to 10% of its cost ?

702 . A book sells for TK. 65. This price gives the seller a profit 30% on his cost. What will bi the new selling price if he cuts his profit to 10% of the costs ?

703 . A borrwer pays 18% interest per year on the first Tk.600 he borrows and 17% per year on the part of the loanin excess of Tk.6000. How much interests will the borrower pay on a loan of Tk.6000 for one year?

704 . A box contains 10 electric bulbs from which 2 bulbs are defective. Two bulbs are chosen at random. What is the probability that one of them is defective?

705 . A box contains 12 poles and 7 pieces of net. Each piece of net weighs 0.2 gm. each pole weighs 1.1 gm. The box and its contents together weigh 16.25 gm. How much does the empty box weigh?

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