Alinked earthwork production system (excavation, load/haul/dump, and spread/compaction) is being used on a highway project. the project will require moving 22,000 bcy of moist loam an average haul distance of 1,400 feet. the excavation will take place in average conditions with a hydraulic excavator utilizing a 1.5 cubic yard bucket. the efficiency factor is 50 min-hr. the haul will utilize dump trucks with a capacity of 12 bcy, an average speed of 14 miles per hour, and a dump time of 2.0 minutes. the grade of the haul route is negligible. the spread and compaction will utilize a dozer with a production rate of 400 bcy per hour.

based on this information, calculate the following: a) production rate for excavation (bcy per hour)b) number of trucks required for efficient operationsc) total duration of excavation activity (hours)