Hi,

Let x represent time it would take to fill the pool if both pipes were working

Question states*** Per hour the Equalizer

 1/15 + 1/24 = 1/x  |Mulitplying thru by 15*24*x so as all denominators = 1

 24x + 15x = 15*24

    39x = 360

      x = 360/39 = 120/13 = 9.23 hr 

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