Question

Two pipes A and B can fill a tank in 15 and 30 minutes respectively. If both the pipes are used together, then how long will it take to fill the tank ?

• A. 10 min
• B. 15 min
• C. 25 min
• D. 50 min

Answer 1

Answer:

A. 10 min

If total work is 30 The efficiency of pipe A = 2 The efficiency of pipe B = 1 Total efficiency = 2 + 1 = 3 Time taken by both pipes = $\frac {30}{3}$ = 10 min