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Question

Pipes 'X' and 'Y' can fill a tank in 15 hours and 10 hours respectively, while pipe 'Z' can empty it in 30 hours. All pipes are opened together when the tank was empty. After 6 hours, pipe 'X' is closed. Find the total time taken to fill the tank.

A 5 hrs

B 9 hrs

C 12 hrs

D 20 hrs

E None of these

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