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Pipe A can fill a tank in 10 hours, P...

Pipe A can fill a tank in 10 hours, Pipe B can fill the same tank in 15 hours. Pipe C can empty the full tank in 20 hours. Pipes A, B and C are opened alternatively for one hours each. If A is opened first, then how many hours will they take to till the empty tank? `24\ h r s` b. `25\ h r s` c. `26\ h r s` d. `24 2/3h r s`

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