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Mathematics, 02.09.2020 06:01 mickellife4659

An oil tanker can be emptied by the main pump in 4 hours. An auxiliary pump can empty the tanker in 11 hours. If the main pump is started at 7 PM, when should the auxiliary pump be started so that the tanker is emptied by 10 PM?

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An oil tanker can be emptied by the main pump in 4 hours. An auxiliary pump can empty the tanker in...

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