If the brisk walk were done at 4.0mi/h how far would the student have to walk to burn pound of fat

Answer 1

The student would need to burn 3500 Calories to burn a pound of fat. The rate at which Calories are burned depends very much upon the person's weight. In addition, some people walk more efficiently than others. See

http://walking.about.com/library/cal/uccalc1.htm

for average data on the Calorie-burning rate for people of different weights.