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Mathematics, 21.06.2021 04:50, whrjegt4jrnfdvj
an oil tanker can be emptied by the main pump in 5 hours. an auxiliary pump can empty the tanker in 8 hours. if the main pump 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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