Question 421889
Bus A speed	60	mph				
Bus B speed	80	mph				
Difference in time=		02:00				
Train A will have covered 120	miles	before bus B starts		
						
catch up distance=120	miles			
catch up speed =	80-60	mph		
catch up speed =	20 mph			
						
Catchup time = catchup distance/catch up speed						
catch up time=120/20		
catch up time=6	hours