math word problem about how long it takes

Question

A field cultivator is the tool that is pulled behind a tractor to work ground in a field. How long would it take to work a 320-acre field (1 mile long and 0.5 mile wide) with a field cultivator that is 60 ft wide if the tractor pulling it goes 7.5 miles per hour? (don't worry about the turnaround time.)

Answer 1

1 hour = 7.5 miles

1.5 miles = 60 min/7.5 miles x 1.5 miles= 12 min