Weighted sumhardFree question
CO₂ emissions by transport mode
| Mode | kg CO₂ per mile |
|---|---|
| Car | 0.54 |
| Train | 0.14 |
Using the chart, how much CO2 from a 3.6-mile car journey then a 15.0-mile train journey?
A2.1 kg
B0.68 kg
C10.04 kg
D4.04 kg
E1.94 kg
Worked solution
Multiply each leg's quantity by its own rate, then add the products. The correct answer is 4.04 kg. Traps to avoid: 2.1 kg comes from the "train leg only" error; 0.68 kg comes from the "added the rates" error; 10.04 kg comes from the "same rate both" error; 1.94 kg comes from the "car leg only" error.
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