6. 5. Looking at our original formula PD+CV CR- CV a. When we increase PD, does the CR increase, decrease, or stay the same? b. When we increase the CV, does the CR increase, decrease, or stay the same? Part III. Horsepower and Torque Problems A tractor pulled a 1200 lb. manure spreader, 500 feet in 2min 30 seconds. How much horsepower would it be using? 7. Calculate how much horsepower is needed to pull a 2000-pound trailer 2 miles in 15 minutes. Hint one mile=5280 feet