A pipe fills a tank in 2 hours of running. Water is supplied only during the first 40 minutes of every hour. Starting at the top of an hour with an empty tank, when is it full?

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After 2 hours 40 minutes. It needs 120 running minutes. Hours 1 and 2 give 80; the first 40 minutes of hour 3 give the rest: 2 h 40 min of clock time.

A pipe fills a tank in 2 hours of running. Water is supplied only during the first 40 minutes of every hour. Starting at the top of an hour with an empty tank, when is it full?

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