Two trains start at the same time from two stations and proceed towards each other at speeds of 50 km/h and 80 km/h respectively.  When they meet, it is found that one train has travelled 120 kms more than the other.  What is the distance(in km) between the two stations?

520

Suppose both trains run only 1 hour then

 Covered distance = 50 + 80 = 130 Units

Difference in distance = 30 km

 30 km Unit → 120

   1 km Unit → 4

130 km Unit → 520 km