Question 854812
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Hi,
Let x represent time for Machine Y working along to finish the task 
{{{ 1/5 + 1/x = 1/2 }}}      |Multiplying thru by 10x so as all denominators = 1
 2x + 10 = 5x
      10 = 3x
     x = 3 <sup>1</sup>&frasl;<sub>3</sub> hrs, time for Machine Y working along to finish the task