If it would take one machine 6 minutes to fill a large production order and another machine 8 minutes to fill the same order, how many minutes would it take both machines working together, at their respective rates, to fill the order?	Pick one.
A) 2 1/60
B) 3 3/7
C) 5 5/11
D) 5 1/2
E) 11
Since , Machine 1-M1 take 6 mins to fill the order   The work done by M1 in a min = 1/6   Machine 2- M2 take 8 mins to fill the same order   and work done by M2 in a min = 1/8   Total work done by M1 and M2 in a min = 1/6 + 1/8 = 7/24   Time needed for M1 and M2 to complete the order = 24/7 = 3 3/7   Answer 3 3/7
<result>B</result>
If it would take one machine 6 minutes to fill a large production order and another machine 8 minutes to fill the same order, how many minutes would it take both machines working together, at their respective rates, to fill the order?