781 . A car is running at a speed of 108 kmph. What distance will it cover in 15 seconds?

A. 55 meters
B. 45 meters
C. 450 meters
D. None of these

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Answer: Option C

Explanation:

1 hour=60×60×60=216000 sec

In 216000 sec it goes 108 km

So, in 15 seconds it goes

(15×108)/216000 km

=0.45km

=0.45×1000 m

=450 meters

(ans)

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782 . A car parking charges n take for the first hour, and m paisa for every additional hour. What amount it will charge if a car stayed for 5 hours?

A. n + 5m
B. m + 5n
C. m + 4n
D. n + 4m

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Answer: Option D

Explanation:

First hour charges = n, remaining 4 hour charges = 4m. Total charges = n + 4m

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A. 10
B. 30
C. 90
D. 120

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Answer: Option C

Explanation:

Time spent = 9:55am to 10:15am = 20 minutes = 1/3 hours.

Average speed = 30 / (1/3) = 90 miles per hour

784 . A car rental agency charges Tk. 2,000 a day plus Tk. 10 per mile for its rental cars. what is the total cost of traveling a total of 400 miles in 4 days in a car rented form this agency ?

A. Tk. 10,450
B. TK. 12,000
C. Tk. 4,800
D. Tk. 14,400

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Answer: Option B

Explanation:

785 . A car traveled 75% of the way from town A to town B at an average speed of 50 mph. The car travels at an average speed of S mph for there remaining part of the trip. The average speed for the entire trip was 40 mph. What is the value of S, in mph?

A. 25
B. 30
C. 20
D. 10
E. None of these

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Answer: Option A

Explanation:

Let the total distance be D.

Distance travelled at 50 mph = 75% of D = 0.75D

Time taken = 0.75D/50 hour

Distance travelled at S mph = 25% of D = 0.25D

Time taken = 0.25D/S hour

Now, 0.75D/50 + 0.25D/S = D/40

or, 0.75/50 + 0.25/S = 1/40 [ dividing both sides by D]

or, 0.25/S = 1/40 - 0.75/50 = (5 - 4×0.75)/200 = 1/100

or, S = 0.25×100 = 25 mph

বাংলাদেশ বনশিল্প উন্নয়ন কর্পোরেশন সহকারী ব্যবস্থাপক-০২.০৮.২০১৩

A. 54
B. 48
C. 42
D. 36

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Answer: Option A

Explanation:

We know, speed=distance/time

Speed = (15*3600)/1000=54km/hr .

Bangladesh Bank - Assistant Director - 2008

A. 0.48
B. 2.4
C. 4.8
D. 2.2
E. None of these

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Answer: Option A

Explanation:

The car can travells 50 miles in an hour or 60 minutes

So, the car can travells 2/5 miles in 60 x (2/5) / 50 minutes = 0.48 minutes

788 . A car travles 180 km from A to B at 60 kilometers/hour and returns from B to A along the same route at 90 kilometers/hour. The average speed in kilometers per hour for the round trip is:

A. 72
B. 36
C. 180
D. 30

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Answer: Option A

Explanation:

Total distance covered = 180 + 180 = 360 km

Time taken in route AB = 180 / 60 = 3 hr

Time taken in route BA = 180 / 90 = 2 hr

Total time taken = 3 + 2 = 5 hr

Average speed = 360 / 5 = 72 km/hr

789 . A car wash center washes 10 cars in half an hour. At this rate how many cars can it wash in 4 hours?

A. 60
B. 20
C. 96
D. 80
E. None of them

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Answer: Option D

Explanation:

Half an hour means 30 Minutes

10 cars are washed in 30 Min

4 hours means (4×60) Minutes it washes =

(10×4×60)÷30 = 80

790 . A carpenter needs 4 boards, each 2 feet 10 inches long,. If wood is sold only by the feet, what is the minimum length, in feet, of wood he must buy?

A. 9
B. 10
C. 11
D. 12

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Answer: Option D

Explanation:

One board is 2 feet 10 inches long.

Fours boards= 8 feet 40 inches long.

40 inches= 3.33 feet. So four boards= 11.33 feet.

Because wood is sold only by feet, the minimum length of wood he needs to buy is 12 feet.

791 . A carpet that measures 5 ft by 9 ft covers 75% of a floor. What is the area of the floor?

A. 60
B. 100
C. 80
D. 90

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Answer: Option A

Explanation:

792 . A carpet that measures 6 ft by 8 ft covers 60% of a floor. What is the area of the floor?

A. 60
B. 100
C. 80
D. 90

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Answer: Option C

Explanation:

793 . A cement mixture is composed of 3 elements. By weight, 1/3 of the mizture is sand, 3/5 is water and the remaining 12 pounds of the mixture is gravel. What is the weight of the entire mixture in pounds?

A. 60
B. 80
C. 90
D. 180
E. None of these

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Answer: Option D

Explanation:

Weight of sand and water = 1/3 + 3/5 = 14/15

remaining weight of gravel = 1 - 14/15 = 1/15

As per Question, 1/15 = 12 pound

1 or Total weight = 12*15 = 180 (Ans)

বাংলাদেশ গ্যাস ফিল্ড | সহকারী-ব্যবস্থাপক | 03-12-2021 || 2021

A. Tk. 45
B. Tk. 32
C. Tk. 36
D. Tk. 40

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Answer: Option A

Explanation:

Let a certain amount is x

A = 3x/10, B = x/4

ATQ,

(3x/10) + (x/4) = x - 81

11x = 20x - 1620

9x = 1620

x = 180

So B gets, 180/4 = 45 Tk (ans)

795 . A certain amount was divided between A and B in the ratio 4 : 3. If B's share was Tk. 4800, the total amount was:

A. Tk. 6400
B. Tk. 11,200
C. Tk. 19,200
D. Tk. 39,200

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Answer: Option A

Explanation:

781 . A car is running at a speed of 108 kmph. What distance will it cover in 15 seconds?

782 . A car parking charges n take for the first hour, and m paisa for every additional hour. What amount it will charge if a car stayed for 5 hours?

783 . A car passes Dhaka at 9:55 am and Gazipur at 10:15 am. Gazipur is 30 miles from Dhaka. What is the average speed of the car in miles per hour?

784 . A car rental agency charges Tk. 2,000 a day plus Tk. 10 per mile for its rental cars. what is the total cost of traveling a total of 400 miles in 4 days in a car rented form this agency ?

785 . A car traveled 75% of the way from town A to town B at an average speed of 50 mph. The car travels at an average speed of S mph for there remaining part of the trip. The average speed for the entire trip was 40 mph. What is the value of S, in mph?

786 . A car travels 15 meters in one second . What is the speed of the car per hour in kilometer ?

787 . A car travels at the rate of 50 miles per hour. How many minutes will it take to travel 2/5 miles at this speed?

788 . A car travles 180 km from A to B at 60 kilometers/hour and returns from B to A along the same route at 90 kilometers/hour. The average speed in kilometers per hour for the round trip is:

789 . A car wash center washes 10 cars in half an hour. At this rate how many cars can it wash in 4 hours?

790 . A carpenter needs 4 boards, each 2 feet 10 inches long,. If wood is sold only by the feet, what is the minimum length, in feet, of wood he must buy?

791 . A carpet that measures 5 ft by 9 ft covers 75% of a floor. What is the area of the floor?

792 . A carpet that measures 6 ft by 8 ft covers 60% of a floor. What is the area of the floor?

793 . A cement mixture is composed of 3 elements. By weight, 1/3 of the mizture is sand, 3/5 is water and the remaining 12 pounds of the mixture is gravel. What is the weight of the entire mixture in pounds?

794 . A certain amount is distributed among A, B and C. A gets 3/10 and B gets 1/4 of the whole amount, If C gets Tk. 81, then B gets:

795 . A certain amount was divided between A and B in the ratio 4 : 3. If B's share was Tk. 4800, the total amount was:

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