Math running problem

Question

A 160 lb person who runs at 8mph for 1 hr burns about 840 calories. the same person walking at 4 mph for 90 min burns about 480 calories. Suppose a 160 lb person runs at 8 mph for 75 min. How far would the person have to walk at 4 mph in order to burn the same number of calories as burned when running?

Answer 1

160 lbs 8 mph 1 hr, 8 miles, 840 calories, 105 calories per mile at 8 mph

169 lbs 8 mph 1.5 hr, 12 miles, 1260 calories

160 lbs 4 mph 1.5 hr, 6 miles, 480 calories

160 lbs 4 mph 1 hr, 4 miles, 320 mph, 80 calories per mile at 4 mph

160 lbs 8 mph 3/4 hr, 6 miles 630 calories

160 lbs 8 mph 5/4 hr=75 minutes, 10 miles 1050 calories

160 lbs 4 mph 2 hrs, 8 miles, 640 calories

1050/320 x 4 = 105/8= 13 1/8 miles at 4 mph to burn 1050 calories, same as 8 mph for 75 minutes

13 1/8 miles times 80 calories per mile = 1050 calories