Question

Two pipes A and B can separately fill a cistern in 60 minutes and 75 minutes respectively. There is a
third pipe at the bottom of the cistern to empty it. If all the three pipes are simultaneously opened, then
the cistern is full in 50 minutes. In how much time can the third alone empty the cistern?
(a) 110 minutes
(b) 100 minutes (c) 120 minutes
(d) 90 minutes​

Answer 1

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