Question 1174271
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The entire job is   15*8 = 120   machine-hours.


Two machines, &nbsp;working &nbsp;10 &nbsp;hours per day each, &nbsp;will complete the job in  &nbsp;&nbsp;{{{120/(2*10)}}} = 6 days.    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>



Solved.