During one week, Charles swam for a total of 2.5 h and walked for a total...
During one week, Charles swam for a total of 2.5 h and walked for a total of 9.0 h. If Charles expends 340 kcal/h swimming and 160 kcal/h walking, how many total kilocalories did he expend for one week?
Express the energy in kilocalories to two significant figures.
Homework Answers
Total calories spent walking = rate of Calorie * time
walking
= 160 kcal/h * 9.0 h
= 1440 kcal
Total calories spent swimming = rate of Calorie * time
swimming
= 340 kcal/h * 2.5 h
= 850 kcal
So,
Total calories spent = 1440 kcal + 850 kcal
= 2290 kcal
Answer: 2.3*10^3 kcal
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