Two pipes P and Q can fill a tank in 20 minutes and 30 minutes respectively There is a waste pipe wh...........

Quantitative Aptitude ( CCS) Pipes&cistern

Two pipes P and Q can fill a tank in 20 minutes and 30 minutes respectively. There is a waste pipe which withdraws water at the rate of 8 litres per minute. Now the tank is full and If all the pipes are opened simultaneously the tank is emptied in 60 minutes. Find the capacity of the tank.

60ltr

70ltr

80ltr

90ltr

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Explanation:

Answer & Explanation
Answer – c) 80ltr
Explanation :
(1/20 + 1/30 – 1/t)*60 = -1
‘-1’ is taken because the work is negative. T is the time taken by the waste pipe to empty the tank alone. We will t = 10
So capacity = 10*8 = 80ltr