Question

14. Pipes A and B can fill a tank in 10 hours and 12 hours respectively. Another pipe C can empty the tank in 20
hours. If all the pipes are opened together, how much time will it take to fill the tank?
a A alone​

Answer 1

Answer:

The water tank will be 100% full in 7.5 hours.

Step-by-step explanation:

In 1 hour pipe A will fill 1/10th of the tank.

In 1 hour pipe B will fill 1/12th of the tank.

In 1 hour pipe C will empty 1/20th of the tank.

So in 1 hour, total

1/10+ 1/12 - 1/20 = 8/60 part is full in 1 hour.

So in 60/8 hours , the tank will be full.

60/8 = 7.5 Hours.

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