App Logo

No.1 PSC Learning App

1M+ Downloads
One tap can fill a water tank in 40 minutes and another tap can make the filled tank empty in 60 minutes. If both the taps are open, in how many hours will the empty tank be filled ?

A2

B2.5

C3

D3.5

Answer:

A. 2

Read Explanation:

Total work= LCM (40,60) = 120 Efficiency of the tap which fill the tank= 120/40 = 3 Efficiency of the tap which empty the tank= 120/-60 = -2 Total efficiency= 3 - 2 = 1 Time taken to fill the tank= 120/1 = 120 minutes = 2 hours


Related Questions:

Thirty men can complete a work in 36 days. In how many days can 18 men complete the same piece of work?
A pipe can fill a tank in 9 hours. Another pipe can empty the filled tank in 63 hours. If both the pipes are opened simultaneously, then the time (in hours) in which the tank will be two-third filled, is:
Two pipes are connected to a water tank. The first pipe can fill the tank in 10 minutes and the second pipe can empty it in 15 minutes. If both pipes opened simultaneously, then find the time in which the tank will be completely filled with water.
Two pipes A and B can fill a tank in 6 hours and 8 hours respectivley. If both the pipes are opened together, then after how many hours should B be closed so that the tank is full in 4 hours ?
One pipe fills a water tank 3 times faster than the other. If the two pipes together can fill the empty tank in 37 minutes, then how much time will the slower pipe alone take to fill the tank?