Empty the ReservoirMath brain teasers require computations to solve.
A large fresh water reservoir has two types of drainage systems, small pipes and large pipes. 6 large pipes, on their own, can drain the reservoir in 12 hours. 3 large pipes and 9 small pipes, at the same time, can drain the reservoir in 8 hours. How long will 5 small pipes, on their own, take to drain the reservoir?
HintThe exact sizes of the pipes and reservoir do not matter.
Answer21 hours and 36 minutes.
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