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At what time the second pipe should be opened so that tank gets full by 11:00 am?

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Two inlet pipes lead into a large water tank.
First pipe can fill the tank in 1 hour 20 minutes; the second pipe can fill it in 50 minutes.
At 10:20 am, the first pipe is opened.
At what time the second pipe should be opened so that tank gets full by 11:00 am?

posted Jan 21, 2022 by Atif

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