For saving energy, bicycling and walking are far more efficient means of transportation than is travel by automobile. For example, when riding at 10.0 mi/h a cyclist uses food energy at a rate of about 400 kcal/h above what he would use if merely sitting still, (In exercise physiology, power is often measured in kcal/h rather than in watts. Here 1 kcal = 1 nutritionist’s Calorie = 4186 J.) Walking at 3.00 mi/h requires about 220 kcal/h It is interesting to compare these values with the energy consumption required for travel by car. Gasoline yields about 1.30 x 108 J/gal. Find the fuel economy in equivalent miles per gallon for a person
(a) Walking, and
(b) Bicycling.