Question Statement :

Ashok and Raj start from city A for city B with different speeds. Ashok left city A one hour earlier than Raj, but Raj was fast and was able to catch up with Ashok in 2 hours after he left the city A. But then Ashok increased his speed to Raj's speed and reached city B in next 5 hours, while Raj decreased his speed to that of Ashok's initial speed. What is the difference in time taken by them to cover the entire distance if the distance between A and B is 42 km?