Question

Pipe A can fill a cistern in 4 hours while pipe B can empty it in 6 hours. If both of them are opened together at the same time when the tank is empty, the number of hours taken by them to fill it, is

Answer 1

MARK AS BRAINLIEST plz

Answer 2

Answer:

Answer is 12

Step-by-step explanation:

pipe A can fill a cistern in 4 hour

In 1 hour 1/6

1/4-1/6 = 3-2/12 = 1/12

in 1 hour a will be 1/12 fill

12 (A)