A leak formed in the ship's hold. They immediately turned on a pump to remove the water, but it was insufficient, and after 10 minutes, the water level in the hold rose by 20 cm. Then, they activated a second pump of the same power, and after 5 minutes, the water level fell by 10 cm. At that point, the leak was repaired.
How long will the pumps take to remove the remaining water?
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