An inlet faucet can fill a small pond in 60 minutes. The pond can be emptied by an outlet pipe in 80 minutes. You begin filling the empty pond by accident. The outlet pipe that empties the pond is left open. Under these conditions, how long will it take for the pond to fill?
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The inlet faucet can fill the pond in 60 minutes, which means it can fill 1/60 of the pond in 1 minute. Show more…
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