Question

One pipe can fill a tank three times as fast as another pipe. If the two pipes together can fill the tank in 36 minutes, then the slower pipe will take how much time to fill the tank alone?

Accepted Answer

D. Let slower pipe fill rate $= x$ units/min. Faster pipe fill rate $= 3x$ units/min. Combined rate $= 4x$ units/min. Total tank capacity $= 4x 	imes 36 = 144x$ units. Time for slower pipe alone $= \frac{144x}{x} = 144$ minutes.

Pipe Efficiency and Tank Filling Time

Explanation

Practise this under exam conditions