Question

The amount of gasoline remaining in car's gas tank is related to how long the car has been driven at a constant speed. Select the graph that best represents the scenario.

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

As the car is travelling at a constant speed, gasoline will be consumed by constant rate.

If the car travels for more time, gasoline usage will be more but the amount will decrease in constant rate.

The graphs (c.) and (d.) depict a proportional relationship between travelling time and amount of remaining gasoline, i.e., if car travels for long, the amount of remaining gasoline will be more, which is strictly incorrect.

In graph (a.), for lower travelling time, the gasoline usage is more as compared to higher travelling time. So, it does not represent that the car is travelling at a constant speed, i.e., consumption of gasoline at constant rate.

Finally, the graph (b.) represents that more travelling time means more consumption of gasoline and the decrement of remaining amount of gasoline follows a constant rate decrement. Hence, graph (b.) correctly relates gasoline remaining in car's gas tank to how long car has been traveled at a constant speed.