A typical adult uses 195kcal/hr of energy while walking, if all the energy in 145kcal were to be burned off by walking, how many minutes would it take for this energy to be used?
(195 kc/60 min) * x min = 145 kc
so
x = (145 * 60 / 195) minutes
so
x = (145 * 60 / 195) minutes