It takes one machine 3 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?	Select the correct option
A) a) 7/12	B) b) 1 1/2	C) c) 1 5/7	D) d) 3 1/2	E) e) 1 1/2
RT = W   Given:   R = 1/3 + 1/3 = 2/3   T = ?   W = 1   T = 1 / (2/3) = 3/2 = 1 1/2   Answer: e) 1 1/2
<result>E</result>
It takes one machine 3 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?