Mathematics, 07.10.2019 21:30 levy72

An oil tanker can be emptied by the main pump in 5 hours. an auxiliary pump can empty the tanker in 12 hours. if the main pump is started at 5 pm, when should the auxiliary pump be started so that the tanker is emptied by 9 pm?

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An oil tanker can be emptied by the main pump in 5 hours. an auxiliary pump can empty the tanker in...

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