What is motion and the types of motion?

The car is a distance time graph which means that the gradient of the graph represents the speed. The steeper the gradient the faster the car. In this case, car B has the lowest gradient and is therefore, the least steep. This means that it has the slowest speed. Moreover, it also means that the rate of change of distance is lower.

Simply saying, the car with the least gradient will cover the least distance in the most time. The car with the steepest gradient will cover the most distance in the smallest time. These difference are plotted on the graph and are able to show the different scenarios at its best.

Based on the graph, the answer to this question is B. Car B is the slowest. It has the longest line that corresponds to the time which means that if all of the cars are going towards the same direction, it is car B that took the longest time to get there.

Car D took the shortest time to get to the location probably because its distance is also not too far but it seems to be almost the same with the time traveled by car C which probably means that car C had a faster speed than all of the other cars.