Question 852457
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Hi,
Let x represent time when both are open
 1/10 - 1/22 = 1/x     |Multiplying thru by 220x so as all denominators = 1
  22x - 10x = 220
      12x = 220
        x = 220/12 = 18 <sup>1</sup>&frasl;<sub>3</sub> hr, time to fill when both are open