A fill pipe can fill a tank in 20 hours a drain pipe can drain a tank in 30 hours If a system of n p...........

Quant (SSC) Pipes&cistern

A fill pipe can fill a tank in 20 hours, a drain pipe can drain a tank in 30 hours. If a system of n pipes (fill pipes and drain pipes put together) can fill the tank in exactly 5 hours, which of the following are possible values of n (More than one option could be correct)?

1.32

2.54

3.29

4.40

1 and 2 only

1 and 3 only

2 and 4 only

2 and 3 only

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Explanation:

2 fill pipes cancel out 3 drain pipes.
Plus, you need an additional 4 fill pipes fill the tank in 5 hours.
so the answer has to be 5k + 4.
Both 54 and 29 are possible.

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