Two trains start from two stations at the same time. Car a runs 48 kilometers per hour and car B 78 kilometers per hour. After 2.5 hours, the two trains meet. How long is the railway between the two stations?

Two trains start from two stations at the same time. Car a runs 48 kilometers per hour and car B 78 kilometers per hour. After 2.5 hours, the two trains meet. How long is the railway between the two stations?


(48 + 78) × 2.5 = 126 × 2.5, = 315 km; a: the railway between the two stations is 315 km long