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Mathematics, 21.08.2021 04:40 arianasg06

A pump can fill a tank in 4 hours. Another pump can fill the same tank in 3 hours, and a third pump can fill it in 4 hours. How long would it take to fill the tank with all pumps working?

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A pump can fill a tank in 4 hours. Another pump can fill the same tank in 3 hours, and a third pump...
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