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  • 5 years ago

pipe a can fill A tanck in 4h. pipe B can fill in 9h less then the time it takes pipe C a drian pipe, to empty the tank. When all 3 pipes are open, it takes 2 hours to fill the tank. How much time is required for pipe C to empty the tank if pipes A and B are closed.

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spraguer (Moderator)
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