If 5 machines can produce 20 units in 10 hours, how long would it take 10 to produce 60 units?
Pick
A) 9
B) 10
C) 15
D) 25
E) 30
5 machines would produce 60 units in 30 hours. Increasing the amount of machines by 2 would mean dividing 30 hours by 2.   30/2= 
<gadget id="calculator">30/2</gadget>
<output>15</output>
15   Answer : 15
<result>C</result>
If 5 machines can produce 20 units in 10 hours, how long would it take 10 to produce 60 units?