Two pipes A and B can fill a tank in 40 minutes and 60 minutes respectively. Find the time taken to fill the tank if pipe C is an emptying pipe whose efficiency is 25% more than that of pipe B.

48 min
54 min
45 min
42 min

Correct answer: 48 min

Solution

A fills 1/40 tank per minute and B fills 1/60 tank per minute. C is an emptying pipe with efficiency 25% more than B, so its emptying rate is 1.25 × 1/60 = 1/48 tank per minute. The net rate of A, B, and C together gives the required time as 48 minutes.

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