Two pipes, P ans Q can fill a cistern in 12 and 15 minutes respectively. Both are opened together, but at the end of 3 minutes the first is turned off. How much longer will the cistern take to fill?

Question

Accepted Answer

12(1 - t/25) = 3 ∴ t = 45/4 = 111/4 minutes ∴ Required answer = 111/4 - 3 = 81/4 minutes

Two pipes, P ans Q can fill a cistern in 12 and 15 minutes respectively. Both are opened together, but at the end of 3 minutes the first is turned off. How much longer will the cistern take to fill?

Discussion & Comments