Shawn started his car (automatic shift),drove 8km and spent 2 minutes at a stoplight.Rachel (driving manual shift) started her car and drove 9km with no stops.Who used more gas?

Presumably Shawn, using an automatic shift, used more gas. However, since we don't know the gas mileage for these vehicles, the question really can't be answered.

table of gas usage

automatic manual

idiling .16L/min .16L/min

starting 0.05L 0.05L

moving 1L/22 km 1L/20 km

To determine who used more gas between Shawn and Rachel, we need to compare their fuel consumption rates. The distance each person drove can be used to estimate their gas usage.

Since Shawn drove 8km and Rachel drove 9km, we can assume that both cars traveled the same distance. However, the type of transmission (automatic versus manual) can affect fuel efficiency.

Automatic shift cars generally consume more gas compared to manual shift cars. This is because automatic transmissions often have more mechanical components and use torque converters, which can lead to higher power losses and less efficient fuel consumption.

Without specific information about the cars, their fuel efficiency ratings, or any additional factors that might affect gas usage, we cannot definitively determine who used more gas based solely on the given information.

To accurately compare gas usage, we would need to know the fuel efficiency ratings of both cars, including their average fuel consumption (in liters per kilometer or miles per gallon). With this information, we could calculate the actual amount of gas used by each person and compare the results.