Answer:
4.752calories
Explanation:
135 pounds = 61.24kg
3.7 mph = 1.65405m/s x 60
= 99.243m/min
Oxygen used = 0.2*speed + 0.9*speed*grade + 3.5
=0.2*99.243 + 0.9*99.243*0.1 + 3.5
= 31.68
Dividing by 200 get calories expenditure per minute = 0.1584
Calroies burned = 0.1584 x 30
= 4.752Calories.