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Mathematics, 31.10.2019 04:31 itisonlyluis

Add a very plan a milk tank and be filled in 8 hours using the end belt using the out valve the tank can be emptied in 12 hours. if both valves are open how long will it take to fill the tank?

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Add a very plan a milk tank and be filled in 8 hours using the end belt using the out valve the tank...
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