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Question

A water vessel is one – fifth full. Tube X can fill a vessel in 5 minutes and tube Y can empty it in 3 minutes. If both the tubes are open, how long will it take to empty or fill the vessel completely?


A

3 min

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B

1.5 min

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C

7.5 min

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D

9 min

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Solution

The correct option is B

1.5 min


The rate at which tank is emptied is more than the rate at which tank is filled.

Both the pipes are open=535×3 =215.

Water level in the tank is 15.

Therefore 15×152 = 1.5 minutes


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