Answer to Question #300255 in Engineering for Rohitash

Question

goods truck arrive randomly at a stockyard with a mean of 8 trucks/hour.a crew of four operatives can unload a truck in 6 minutes. trucks waiting in queue to be unloaded are paid a waiting charge at the rate of 60/hour, operative are paid a wage rate of 20/hour.it is possible to augment the crew strength to 2 or 3 (of four operatives per crew) when the unloading time will be 4 minutes or 3 minutes respectively per truck.find the optimal crew