Exercise 20

You want to determine the number of docks required for a receiving and shipping facility. The costs of operating a truck are $ 35.00 per hour and the cost of operating a dock is $ 50 per hour. 2 trucks arrive at this warehouse per hour and 1.5 trucks leave per hour. A truck is loaded is .6 hour and the time to unload is .7 hour.

a) If the receiving and shipping docks are to be shared, determine the effective entry ratio and the weighted average time of service time. (10 pts) b) What is the minimum number of springs needed for the system to reach steady state? (10 pts) c) Determine the cost per hour to operate the system if 4 springs are used. (10 pts)