Question

A cistern can be filled by pipe A and B in 4 hours and 6 hours respectively. When full, the cistern can be emptied by a pipe C in 8 hours. if all the pipe be turned on at the same time, the cistern will be full in..​

Answer 1

Step-by-step explanation:

A pipe = 1/4

B pipe = 1/6

So add them both

1/4 + 1/6

6/24 + 4/24

= 10 / 24 hours and 10/24 becomes 5/12 hours