Consider a wheel-type tractor-pulled scraper whose gross weight is 118,700 lb. What is the equivalent gain, in horsepower (hp), resulting from operating this vehicle down a 4% slope instead of up the same slope at a speed of 12 mph? One horsepower equals 33,000 ft-lb of work per minute.

Consider a wheel-type tractor-pulled scraper whose gross weight is 118,700 lb. What is the equivalent gain, in horsepower (hp), resulting from operating this vehicle down a 4% slope instead of up the same slope at a speed of 12 mph? One horsepower equals 33,000 ft-lb of work per minute.