Question 30
A bus and a truck started travelling towards each other at the same instant, from cities A and B respectively. When they met along the road after 6 hours, the bus was 240 km away from city B. Upon reaching city B, the bus stopped for one hour of maintenance, before it headed back to city A. The truck took 15 hours to travel from city B to city A, and also stopped for one hour of maintenance before going back to city B. The bus and the truck met again on their ways back to their cities of origin. How many hours had passed between their first and second encounters?