It takes one machine 2 hours to complete a production order and another machine 3 hours to complete the same order. How many hours would it take both amhcines working simultaneously at their respective rates to complete the order?
Choose one
A) a) 7/12
B) b) 1 1/5
C) c) 1 5/7
D) d) 3 1/2
E) e) 7
RT = W   Given:   R = 1/3 + 1/2 = 5/6   T = ?   W = 1   T = 1 / (5/6) = 6/5 = 1 1/5   Answer: b) 1 1/5
<result>B</result>
It takes one machine 2 hours to complete a production order and another machine 3 hours to complete the same order. How many hours would it take both amhcines working simultaneously at their respective rates to complete the order?