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Two pies A and B can separately fill a cistern in 60 min and 75 min respectively.. There is a third pipe in the bottom of the cistern to empty it. If all the three pipes are simultaneously opened, then the cistern is full in 50 min In how much time the third pipe alone can empty the cistern ?

 

[SBI PO 3 july 2016 shift 2]
A
B
C
D
E
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