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A cistern has two pipes. One can fill it...

A cistern has two pipes. One can fill it with water in 15 hours and other can empty it in 12 hours. In how many hours will the cistern be emptied if both the pipes are opened together when `(3)/(5)`th of the cistern is already full of water?

A

A)36 hr

B

B)24 hr

C

C)60 hr

D

D)45 hr

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Verified by Experts

The correct Answer is:
A
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  13. A cistern has two pipes. One can fill it with water in 15 hours and ot...

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  14. A and B undertake to do a piece of work for Rs.999. A can do it in 10 ...

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