Question

There are two pipes in a tank. If pipes A an B is opened together the tank will be filled in 12 minutes. If pipe A a alone is opened the tank will be filled in 15 minutes if pipe B alone is opened the tank will be filled in how many minutes ?

• A. 20 minutes
• B. 25 minutes
• C. 30 minutes
• D. 60 minutes

Answer 1

Answer:

D. 60 minutes

Total capacity of tank = LCM[12, 15] = 60 Efficiency of A + B= 60/12 = 5 Efficiency of A = 60/15 = 4 Efficiency of B = 5 - 4 = 1 Time taken by B to fill the tank = 60/1 = 60 minute