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3 pumps, working 6 hours a day, can empy a water tank in 2 days. How many hours a day must 9 pumps work to empty the same tank in 1 day?

  • math -

    3 pumps ----> working 6 hours --- 2 days
    6 pumps ----> working 6 hours --- 1 day
    1 pump -----> working 36 hrs ---- -1 day
    9 pumps ----> working 4 hrs ------ 1 day

    or

    it takes 18 pump-hrs running for 2 days
    it takes 36 pump-hrs to do it in 1 day
    so 9 pumps would take 4 hrs to do it in 1 day

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