An "energy bar" contains 19g of carbohydrates. If the energy bar was his only fuel, how far could a 68kg person walk at 5km/hr ?

Answer 1

To determine how far a person could walk after consuming an energy bar, we first need to know the number of calories contained in the 19g of carbohydrates.

1 gram of carbohydrates contains 4 calories. So,

19g of carbohydrates * 4 calories/g = 76 calories

Next, we need to find out how many calories a 68kg person burns while walking. The general formula for this is:

Calories burned per hour = MET * body weight in kg * 0.0175 (walking has a MET value of 2.8)

For walking at 5 km/hr, the MET value is approximately 3.3. Thus,

Calories burned per hour = 3.3 * 68 * 0.0175 = 3.8922 calories/minute

Next, we need to determine how many minutes the person can walk with the provided calories.

76 calories / 3.8922 calories/minute ≈ 19.52 minutes

Now that we have the minutes, let's find the distance by multiplying that by the walking speed.

Distance = walking speed * time

Distance = 5 km/hr * (19.52 minutes / 60 minutes) ≈ 1.63 km

So, after eating the energy bar, a 68kg person could walk approximately 1.63 km at a speed of 5 km/hr.