Shawn started his car(automatic shift),drove 8km and spent 2 minutes at a stop light.Rachel(driving a manual shift) started her car and drove 9km with no stops.Who used more gas?
table of gas usage
automatic manual
idiling:.16L/min .16L/min
starting:0.05L 0.05L
moving:1L/22km 1L/20km
In 8 km, Shawn used 0.364 L (22/8)
He stopped at a light and used 0.32 L (.16 * 2).
His total liters was 0.684 L
In 9 km, Rachel used 0.45 L (9/20)
Shawn
To determine who used more gas, we need to calculate the gas usage for both scenarios.
Shawn:
- Starting the car: 0.05L
- Driving 8km: 8km * (1L/22km) = 0.36L
- Idle time (2 minutes): 2 minutes * (0.16L/min) = 0.32L
Total gas usage for Shawn: 0.05L + 0.36L + 0.32L = 0.73L
Rachel:
- Starting the car: 0.05L
- Driving 9km: 9km * (1L/20km) = 0.45L
Total gas usage for Rachel: 0.05L + 0.45L = 0.50L
Therefore, Shawn used more gas than Rachel.