Draining a tank
A tank can be drained using two outlets. The larger outlet alone drains the tank in 8 hours, the smaller outlet alone in 10 hours. At the last drainage, both outlets should have been open, but the shut-off of the larger outlet got stuck and was only opened an hour after the smaller outlet was opened. How long did the drainage take? As the unknown choose the time during which the smaller outlet was open.
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