Three machines operating independently, simultaneously, and at the same constant rate can fill a certain production order in 52 hours. If one additional machine were used under the same operating conditions, in how manyfewerhours of simultaneous operation could the production order be fulfilled? Options:
A) 6
B) 9
C) 12
D) 27
E) 13
If 3 Machines can do the work in 36 hr then 4 Machines can do the work in   3/4*52= 
<gadget id="calculator">  3/4*52</gadget>
<output>39</output>
39 Hrs. hence time saved will be 13hr   option 13 is the correct answer
<result>E</result>
Three machines operating independently, simultaneously, and at the same constant rate can fill a certain production order in 52 hours. If one additional machine were used under the same operating conditions, in how manyfewerhours of simultaneous operation could the production order be fulfilled?