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Mathematics, 08.10.2019 00:30 zoeyandblaze
Aswimming pool can be filled by one pump in 5.1 hours and by another pump in 3 hours and 50 minutes. if the first pump starts operating, after the second pumps worked 1.5 hours, how long will it take the two pumps to fill in the pool full together?
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Aswimming pool can be filled by one pump in 5.1 hours and by another pump in 3 hours and 50 minutes....
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