751 . A can do a piece of work in 4 hours, B and C together can do it in 3 hours , while A and C together can do it in 2 hours. How long will B alone take to do it?

A. 8 hours
B. 10 hours
C. 12 hours
D. 24 hours
E. None of these

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Answer: Option C

Explanation:

A 1 hour work = 1/4

(B + C) 1 hour work = 1/3

(A + C) 1 hour work = 1/2

(A + B + C) 1 hour work = (1/4 + 1/3) = 7/12

B 1 hour work = ( 7/12 - 1/2) = 1/12

B alone will take 12 hour to do the work.

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752 . A can do a work in 20 days, and B in 30 days. They work together for 6 days. How much of the work is left?

A. $\frac{1}{3}$
B. $\frac{1}{2}$
C. $\frac{1}{4}$
D. $\frac{2}{5}$

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Answer: Option B

Explanation:

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সমন্বিত ৫ ব্যাংক ও ১ আর্থিক প্রতিষ্ঠান — অফিসার (ক্যাশ) (11-07-2025) | 2025

A. 2/5
B. 1/6
C. 1/9
D. 2/7

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Answer: Option B

Explanation:

Hints: Given that B alone can complete the same work in day = half the time taken by A = 9 days

A's One day's work = 1/18

B's One days work = 1/9

(A + B)'s one days work = 1/18 + 1/9 = 1/6

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754 . A can finish a work in 5 days and B takes 4 days to do the same work. If the work is increased by 8 times, how many days will it take for both of them to finish the work if they work together?

A. 10 days
B. 15 days
C. 20 days
D. 25 days

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Answer: Option C

Explanation:

new work size = 1 + 8 = 9 works.
A & B can do in 1 day (working together) = 1/5 + 1/4 = 9/20
Required number of days = 9/(9/20) = 20 days. Ans: C

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

A. 60
B. 80
C. 200
D. None of these

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Answer: Option B

Explanation:

Let the maximum marks be 'x'.

Then, according to the question.

(25 % of x) + 30 = (50 % of x) - 20

⇒ x/4 + 30 = x/2 - 20

⇒ (x/4) - (x/2) = - 20 - 30

⇒ (x - 2x)/4 = - 50

⇒ - x/4 = - 50

⇒ - x = - 200

⇒ x = 200

So, the maximum marks are 200.

Minimum passing marks are = x/4 + 30 = 200/4 + 30 = 50 + 30 = 80 marks

Minimum passing marks are 80

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756 . A car goes 15 km on a gallon of octane when it is driven at 50 km/h. When the car is driven at 60 km/h, it only goes 80% as far. How many gallons of octane are needed to travel 200 km if half the distance is traveled at 50 km/h and the rest 60 km/h?

A. 15.00
B. 16.67
C. 10.60
D. 14.00

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Answer: Option A

Explanation:

প্রতিক্ষেত্র গতি ৫০ কিমি/ঘন্টায়

দ্বিতীয় ক্ষেত্রে গতি ৬০ কিমি/ঘন্টায়

প্রতি গ্যালন এ যায় = ১৫ × ৮০/১০০ = ১২ কিমি

৫০ কিমি/ঘন্টায়,

৫ কিমি যায় = ১ গ্যালন অকটেনে

২০০/২ = ১০০ কিমি যায় = ১০০/১৫ গ্যালন

আবার, ৬০ কিমি/ঘন্টায়

১২ কিমি যায় = গ্যালন অকটেনে

১০০ কিমি যায় = ১০০/১২ গ্যলনে

মোট যায় = ১০০/১৫ + ১০০/১২ = ৪০০ + ৫০০/৬০ = ৯০০/৬০ = ১৫ গ্যলন

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757 . A car got 33 miles per gallon using gasoline that coast $295 per dollars. Approximatley what was the cost, in dollars, of the gasoline used in driving the car 350 miles?

A. $10
B. $31
C. $40
D. $50

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Answer: Option B

Explanation:

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Dhaka Bank Ltd | Probationary Officer | 05-02-2021

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

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Answer: Option A

Explanation:

150 ÷ 1000 = ভাগশেষ = 100, ভাগফল = 6

100 km/hr বেগে 1000 km অতিক্রম করে 10 ঘন্টায় । কিন্তু 150km পর পর থামার কারনে সময় ব্যায় হয়। ( 6 × 10) মিনিটে বা 60 মিনিট বা 1 ঘন্টা

মোট সময় লাগে ( 10 + 1) = 11 ঘন্টা।

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759 . 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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760 . A car owner buys petrol at Tk. 17, Tk. 19 and Tk. 20 per litre for three consecutive years. Computer the average cost per litre, if he spends Tk. 6460 per year.

A. Tk. 18.49
B. Tk. 18.58
C. Tk. 19.20
D. Tk. 21.66

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Answer: Option B

Explanation:

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সমন্বিত পাঁচ ব্যাংক || অফিসার ক্যাশ - 06.11.2021

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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NRBC BANK PO/TAO (16-06-2023) || 2023

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

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763 . 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

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764 . 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

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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 .

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Bangladesh Bank - Assistant Director - 2008

751 . A can do a piece of work in 4 hours, B and C together can do it in 3 hours , while A and C together can do it in 2 hours. How long will B alone take to do it?

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753 . A can finish a work in 18 days and B can do the same work in half the time taken by A. Then, working together, what part of the same work they can finish in a day ?

754 . A can finish a work in 5 days and B takes 4 days to do the same work. If the work is increased by 8 times, how many days will it take for both of them to finish the work if they work together?

755 . A candidate scoring 25% marks in an examination fails by 30 marks while another candidate who score 50% marks gets 20 marks more than the minimum pass marks. what is the minimum pass mark?

756 . A car goes 15 km on a gallon of octane when it is driven at 50 km/h. When the car is driven at 60 km/h, it only goes 80% as far. How many gallons of octane are needed to travel 200 km if half the distance is traveled at 50 km/h and the rest 60 km/h?

757 . A car got 33 miles per gallon using gasoline that coast $295 per dollars. Approximatley what was the cost, in dollars, of the gasoline used in driving the car 350 miles?

758 . A car is driven at the speed of 100 km/hr and stops for 10 minutes at the end of every 150 km. To cover a distance of 1000 km, it will take.

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

760 . A car owner buys petrol at Tk. 17, Tk. 19 and Tk. 20 per litre for three consecutive years. Computer the average cost per litre, if he spends Tk. 6460 per year.

761 . 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?

762 . 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?

763 . 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 ?

764 . 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?

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

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