An inlet fills a factory's coolant tank in 8 hours, while an outlet empties the full tank in 20 hours. If both are opened together on the empty tank, how long will the tank take to fill (in hours)?

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Accepted Answer

13 1/3. Net rate = 1/8 − 1/20 = (5 − 2)/40 = 3/40 per hour, so the time is 40/3 = 13 1/3 hours.

An inlet fills a factory's coolant tank in 8 hours, while an outlet empties the full tank in 20 hours. If both are opened together on the empty tank, how long will the tank take to fill (in hours)?

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