The speed of Ashu is 15 km/h more than the speed of Vishu. They start moving in the same direction at the same time, but initially Vishu is ahead of Ashu by a certain distance. If Ashu crosses Vishu 6 hours after they start moving, what is the initial distance between them?

90 km

Given : -

Relative speed= 15 km/h

Time taken by them to meet = 6 hours

Distance = Speed × Time

Distance = 15 × 6 = 90 km