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Multiple Choice Questions

Two taps X and Y are fixed to a water tank If only X is opened it drains out the full tank of water ...........

Quantitative Aptitude (CDS) Time and work

Two taps X and Y are fixed to a water tank. If only X is opened, it drains out the full tank of water in 20 minutes .If both X and Y are opened , then they drain out the full tank of water in 15 minutes . If only Y is opened , how long does it take to drain out the full tank of water?

30 minutes

45 minutes

60 minutes

90 minutes

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Explanation:

In one minute x drains out 1/20 parts
In one minute x + y drain out 1/15 parts
in one minute y drains out = 1/15 -1/20 = 1/60
hence tap y alone drains out tank in 60 minutes.

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