Three machines operating independently, simultaneously, and at the same constant rate can fill a certain production order in 40 hours. If one additional machine were used under the same operating conditions, in how manyfewerhours of simultaneous operation could the production order be fulfilled? Pick
A) 6 B) 9 C) 10 D) 27 E) 48
If 3 Machines can do the work in 40 hr then 4 Machines can do the work in   3/4*40= 
<gadget id="calculator">  3/4*40</gadget>
<output>30</output>
30 Hrs. hence time saved will be 10hr   option 10 is the correct answer
<result>C</result>
Three machines operating independently, simultaneously, and at the same constant rate can fill a certain production order in 40 hours. If one additional machine were used under the same operating conditions, in how manyfewerhours of simultaneous operation could the production order be fulfilled?