Mathematics, 26.07.2019 13:00 spiritcampbell56
Two grain-collecting machines can collect all the grain from a field 9 days faster than if the first one was doing it alone and 4 days faster than if the second one was working alone. how long does it take each grain-collecting machine to collect all the grain by itself?
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Two grain-collecting machines can collect all the grain from a field 9 days faster than if the first...
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