Mathematics, 20.02.2020 03:15 ramanpreet
F one pump can inflate an air mattress in 21 minutes and a second pump can inflate the same mattress in 42 minutes, find the amount of time that would be needed for the two pumps working together to inflate the mattress.
Answers: 3
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F one pump can inflate an air mattress in 21 minutes and a second pump can inflate the same mattress...
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