Cars A and B leave from the same town at the same time and travel in opposite directions

Cars A and B leave from the same town at the same time and travel in opposite directions. Car A travels at the speed of 40 kph and car B at 60 kph. In how many hours will the two cars be 350 km apart?

A. 2.5 C. 4.5
B. 3.5 D. 5.5

Solution