A planned fleet of forklift trucks has an average travel distance per delivery = 500 ft loaded and an average empty travel distance = 350 ft. The fleet must make a total of 60 deliveries per hour. Load and unload times are each 0.5 min and the speed of the vehicles = 300 ft/min. The traffic factor for the system = 0.85. Availability = 0.95, and worker efficiency = 90%. Determine
(a) Ideal cycle time per delivery,
(b) The resulting average number of deliveries per hour that a forklift truck can make, and
(c) How many trucks are required to accomplish the 60 deliveries per hour?