Brain Teasers
Empty the Reservoir
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?
Hint
The exact sizes of the pipes and reservoir do not matter.Answer
21 hours and 36 minutes.Hide Hint Show Hint Hide Answer Show Answer
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