Question

1. Two pipes A and B can fill a tank in
12 hours and 24 hours respectively. If
both pipes are opened together, the
time taken to fill the tank is. *
4 hours
O 8 hours
O 12 hours
O 16 hours

Answer 1

Step-by-step explanation:

Cistern filled by both pipes in one hour = 1/12+1/20=2/15th

Therefore both pipes filled the cistern in 15/2hrs.

Now, due to leakage both pipes filled the cistern in 15/2+30/60=8hrs.

Therefore Due to leakage, filled part in one hour = 1/8

Therefore part of cistern emptied, due to leakage in one hour = 2/15-1/8= 1/120th

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