Efficiency is a way of comparing the benefits to the cost. Eff - benefit / cost
1a) Jamal's job is about 4 km (4000 m) away from his home. He often walks to work, burning about
400 Calories in the process. Express the efficiency of his trip in m/Cal.
Benefit = 4000 m of travel
Cost = 400 Cal of energy
Eff-
1b) Jamal bought a bicycle with the money he eamed working. When he rides his bicycle to work
instead of walking, he only burns about 100 Calories. Express his efficiency in m/Cal.
2) Jamal doesn't just spend Calories traveling to work. He also spends time. It takes him an hour (60
min) to walk 4 km (4000 m), but only takes him 12 minutes to bicycle that same distance,
2a) Express the efficiency of walking in terms of m/min.
2b) Express the efficiency of cycling in terms of m/min.
3a) Owning a car costs more than just buying it. There are registration fees, insurance costs, and
maintenance as well. Mr Polyak drove his old Ford Ranger for 240,000 miles before replacing it. All
together, Mr polyak spent about $80,000 on it. (514k purchase price, $39k gas, $12k registration and
insurance, $15k maintenance & repair) Express the efficiency of the truck in terms of miles/$.
3b) A serious bike rider might spend $800 owning and maintaining a good bicycle before buying
a new one. During that time, they might ride it 20,000 miles. Express the efficiency of that bicycle in
terms of miles/$