A tank is already 1 4 full Two taps fill the tank in 10 hours and 15 hours respectively Another tap ...........

Quantitative Aptitude ( CCS) Pipes&cistern

A tank is already 1/4 full. Two taps fill the tank in 10 hours and 15 hours respectively. Another tap can empty in 5 hours. If three pipes are opened, how much time does it take to empty the tank ?

28.6

22.5

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Explanation:

Required time x hours. Then,
x(1/5 -(1/10 + 1/15)) = 3/4
=> x((6-3-2)/30) = 3/4
x = 3/4 *30 = 45/2 = 22.5 hours.
.'. It takes 22.5 hours to empty the tank.