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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