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Question

Pipes K and L alone can fill a tank in 4 hours and 6 hours respectively. When both pipes along with pipe M, an outlet pipe, are opened together, 3/4 of the tank gets filled in 120 minutes. Find the time taken by pipe M to empty a completely filled tank.

A 18 hours

B 20 hours

C 22 hours

D 24 hours

E 26 hours

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