Question 504380
Train A  	75	mph							
Train B 	125	mph							
Difference in time=		04:00	=>	4	hours				
Train A  	will have covered	300	miles	before 	Train B 		starts	from station	
catch up distance=		300	miles						
catch up speed =		125	-75	mph					
catch up speed =		50	mph						
Catchup time = catchup distance/catch up speed									
catch up time=		300	/	50					
catch up time=		6	hours						
									
Train B 	speed	=	125	mph					
Time to catch up		=	6	hours					
D=Speed * time									
D= 	125	*	6						
D= 	750	miles							
Train B 	will catch up	when it has traveled		750	miles