Question

A quarter-pound burger provides 450 kcal of energy. How long would a 140 lb -person have to walk to burn those calories if 1.0 h of walking uses about 210 kcal ?

Express your answer to two significant figures and include the appropriate units.

Answer 1

Solution :-

Energy provided by burger = 450 kcal

Rate of calorie burn by 140 lb person is 210 kcal per hour.

Lets calculate how long a person need to walk to burn 450 kcal

210 kcal = 1.0 h

450 kcal = ? h

450 kcal * 1 h / 210 kcal = 2.1 h

So person need to walk for 2.1 hour to burn 450 kcal energy.