Question

Problem 2: Evaluate cost and production using a 3-cy hoe to load wet gravel (2980 lb/lcy) into 14 cy trucks. Assume a bucket fill factor of 105% and that the hoe bucket swing cycle time is 24 sec. the truck empty weight is 36860 lb, and a rated payload of 40000 lb. Dump time will be 1.3 min. the haul distance is 2.5 miles from the pit to the plant up a 3% grade. The rolling resistance of the haul road will be maintained at 3%. The hoe and operator cost $97 per hour, and trucks cost $49 per hour What is the most cost-effective mix of bucket loads to use in loading the trucks and number of trucks to place on this job?

please help me.

Answer 1