A farmer drives a tractor from one town to another, a distance of 120 miles. He drives 10 mph faster on the return trip, cutting 1 hour off the time. How fast does he drive each way? A) 40 mph going and 30 mph returning B) 60 mph going and 70 mph returning OC) 40 mph going and 50 mph returning OD) 30 mph going and 80 mph returning E) 30 mph going and 40 mph returning