Hi,

two hoses are working together to fill a swimming pool.

one of the hoses can fill the pool alone in 7 hours the other can fill the pool alone in 12 hours 

how long     would it take both hoses to fill the pool together?

  PER hr KEY

 1/7 + 1/12 = 1/x   |Multiplying thru by 84x so as all denominators = 1

  12x + 7x = 84

    19x = 84

      x = 4.42 hr 

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