Question

6. Two pipes can fill a tank in 10 hours and 12 hours
respectively while a third pipe empties the full
tank in 20 hours. If all the three pipes are opened
simultaneously, in how much time the tank will
be filled 2
191​

Answer 1

Answer:

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