Question

Pipes D and E alone can fill a tank in 5 hours and 3 hours respectively. When both pipes along with pipe F, an outlet pipe, are opened together, 1/2 of the tank gets filled in 60 minutes. Find the time taken by pipe F to empty a completely filled tank.

A 20 hours
B 25 hours
C 30 hours
D 35 hours
E 40 hours
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