By Poonam

Verified by Ajay Kumar

A tank has two pipes, one can fill it with water in 14 hours and the other can empty it in 8 hours. In how many hours will the tank be emptied if both the pipes are opened together when 1/4th of the tank is already filled with water?

  1. 6 hours

  2. 5 hours

  3. 3 hour 20 min

  4. 4 hours 40 min

Answer: D

Solution

Net emptying rate = 1/8 − 1/14 = 3/56 tank per hour. The tank initially contains 1/4 water. Time = (1/4)/(3/56) = 14/3 hours = 4 hours 40 minutes.

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