slodziak120 slodziak120
  • 03-10-2018
  • Mathematics
contestada

one pump can empty the pool in 5 days, whereas a second pump can empty the pool in 7 days. how long it will take the two pumps, working together, to empty the pool?

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Maxxxie Maxxxie
  • 03-10-2018
4 days jfjdhsbsiegebehehebeihrhe
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