Estimate the cycle time and production of a 30-cubic-yard wheel tractor scraper carrying rated capacity, operating on a 4,500-foot level haul. The road flexes under load, has little maintenance, and is rutted. Material is 3,000 lb/BCY. The scrapers are push-loaded by one 385-horsepower, tracktype pusher tractor. How many scrapers can be served by this one pusher?