Pipes and Cisterns Practice Test 1 with solutions

Question : 4 of 40

Marks: +1, -0

Pipes A and B can fill a cistern in 5 and 7 hours respectively. Both the pipes are opened simultaneously, but after

2 1/2

hours, Pipe A is closed. How many hours will Pipe B takes to fill the remaining part of the cistern?

Solution:

Part of cistern filled by A and B in 1 hour =

1/5 + 1/7

{12}/{35}

Part of cistern filled by A and B in

2 1/2

hours =

{12}/{35} × 5/2

6/7

Remaining part = 1 -

6/7

1/7

So,

1/7

th part of the cistern will be filled by B alone in 1 hour.

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