Question

A cistern can filled a pipe A and B in 4 hr and hr respectively . When full , the cistern can be emptied by a c in 8 hr . If all pipes be turn on at the same time , tr he cistern will be full​

Answer 1

Answer:

Part filled in 1 hr = (1/4 + 1/6) = 5/12, Part emptied in 1 hr = 1/8

Net filling in 1 hr = (5/12 - 1/8) = 7/24

therefore

Time taken to fill the tank = 24/7 hr

= 3 hours 26 minute

Answer 2

Step-by-step explanation:

Time taken to fill the tank = (1/5)+(1/6)-(1/12)

=60/17 hrs