Question 419177
Train A speed	40	mph					
Train B speed	44	mph					
							
Train A passes station at 	04:20					
Train B passes station at		04:50					
							
Difference in time=		00:30	30				
Train A will have covered 20	miles	before Train B starts			
							
catch up distance=	20	miles				
catch up speed =		44	-40	mph			
catch up speed =		4	mph				
							
Catchup time = catch up distance/catch up speed							
catch up time=		20	/	4			
catch up time=		5	hours				
catch up time=		300	minutes