Answer:
3 15/17 hours
Step-by-step explanation:
Sue's rate of completion is ...
1/6 order per hour
Jim's rate of completion is ...
1/11 order per hour
Assuming they can appropriately divide the work, their total rate of completion will be ...
(1/6 + 1/11) = (11+6)/(66) = 17/66 . . . . order per hour
The time for one order is the inverse of that: 1/(17/66) ...
66/17 hours per order = 3 15/17 hours per order
Working together, it will take Sue and Jim 3 15/17 hours to fill the order.
