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What is the correct answer?

4

Two pipes can fill the cistern in 10hr and 12 hr respectively, while the third empty it in 20hr. If all pipes are opened simultaneously, then the cistern will be filled in

A. 7 hr

B. 7.5 hr

C. 8 hr

D. 8.5 hr

Correct Answer :

B. 7.5 hr


Work done by all the tanks working together in 1 hour.
       110+112-120=215
Hence, tank will be filled in 152=7.5 hr

Related Questions

What is the correct answer?

4

A tyre has two punctures. The first puncture alone would have made the tyre flat in 9 minutes and the second alone would have done it in 6 minutes. If air leaks out at a constant rate, how long does it take both the punctures together to make it flat ? 

A. 315min

B. 325min

C. 335min

D. 345min

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4

A is twice as good as workman as B and together they finish a piece of work in 18 days. In how many days will B alone finish the work.

A. 50 days

B. 54 days

C. 55 days

D. 60 days

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4

A completes 80% of a work in 20 days. Then B also joins and A and B together finish the remaining work in 3 days. How long does it need for B if he alone completes the work?

A. 3412

B. 3512

C. 3612

D. 3712

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4

Mr. Rocky is on tour and he has Rs 360 for his expenses. If he exceeds his tour by 4 days he must cut down daily expenses by Rs 3. The number of days of Mr. Ram's tour programme is

A. 24 days

B. 22 days

C. 28 days

D. 20 days

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4

Worker A takes 8 hours to do a job. Worker B takes 10 hours to do a job. How long should it take both A and B, working together to do same job.

A. 149

B. 249

C. 349

D. 449

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4

5 men and 2 boys working together can do four times as much work as a man and a boy. Working capacity of man and boy is in the ratio

A. 1:2

B. 2:1

C. 1:3

D. 2:3

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4

To complete a work A and B takes 8 days, B and C takes 12 days, A,B and C takes 6 days. How much time A and C will take

A. 12 days

B. 8 days

C. 18 days

D. 24 days

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4

A and B can together complete a piece of work in 4 days. If A alone can complete the same work in 12 days, in how many days can B alone complete that work ?

A. 6 days

B. 5 days

C. 8 days

D. 7 days

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4

A does half as much work as B in three-fourth of the time. If together they take 18 days to complete the work, how much time shall B take to do it

A. 25 days

B. 26 days

C. 28 days

D. 30 days

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4

10 women can complete a work in 7 days and 10 children take 14 days to complete the work. How many days will 5 women and 10 children take to complete the work?

A. 7 days

B. 8 days

C. 9 days

D. 10 days

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4

A man can do a piece of work in 5 days, but with the help of his son he can do it in 3 days. In what time can the son do it alone ?

A. 412 days

B. 512  days

C. 612 days

D. 712 days

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4

A can do a job in 16 days, B can do same job in 12 days. With the help of C they did the job in 4 days. C alone can do the same job in how many days ?

A. 935 days

B. 835 days

C. 512 days

D. 412 days

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4

A alone can do a piece of work in 6 days and B alone in 8 days. A and B undertook to do it for Rs. 3200. With the help of C, they completed the work in 3 days. How much is to be paid to C

A. Rs. 200

B. Rs. 400 

C. Rs. 600

D. Rs. 800

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4

4 men and 6 women finish a job in 8 days, while 3 men and 7 women finish it in 10 days. In how many days will 10 women working together finish it ?

A. 40 days

B. 30 days

C. 60 days

D. 50 days

What is the correct answer?

4

Two pipes can fill the cistern in 10hr and 12 hr respectively, while the third empty it in 20hr. If all pipes are opened simultaneously, then the cistern will be filled in

A. 7 hr

B. 7.5 hr

C. 8 hr

D. 8.5 hr

What is the correct answer?

4

A can do a certain job in 25 days which B alone can do in 20 days. A started the work and was joined by B after 10 days. The number of days taken in completing the wotk were ?

A. 1323kmph

B. 1423kmph

C. 1523kmph

D. 1623kmph

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4

A can do a piece of work in 4 hours . A and C together can do it in just 2 hours, while B and C together need 3 hours to finish the same work. In how many hours B can complete the work ?

A. 12 hours

B. 15 hours

C. 17 hours

D. 20 hours

What is the correct answer?

4

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

A. 1/6

B. 1

C. 1/8

D. 1/9

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4

A piece of work can be done by 6 men and 5 women in 6 days or 3 men and 4 women in 10 days. It can be done by 9 men and 15 women in how many days ?

A. 2 days

B. 3 days

C. 4 days

D. 5 days

What is the correct answer?

4

A is thrice as good a workman as B and takes 10 days less to do a piece of work than B takes. B alone can do the whole work in

A. 15 days

B. 10 days

C. 8 days

D. 6 days

What is the correct answer?

4

A can do a piece of work in 15 days and B alone can do it in 10 days. B works at it for 5 days and then leaves. A alone can finish the remaining work in

A. 5 days

B. 6.5 days

C. 7.5 days

D. 8 days