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Question

Pipes 'J' and 'K' can fill a tank in 12 hours and 18 hours respectively, while pipe 'L' can empty it in 36 hours. All pipes are opened together when the tank was empty. After 2 hours, pipe 'J' is closed. Find the total time taken to fill the tank.

A 12 hrs

B 25 hrs

C 30 hrs

D 18 hrs

E None of these

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