Question 902557
Goods train	60	km/h				
Express 	90	km/h				
Goods train		03:00				
Express 		06:00				
Difference in time=		03:00	=>	3.00	hours	
Goods train	will have covered	180.00	km 	when	Express 	starts
catch up distance=		180.00	km 			
catch up speed =		90	-60			
catch up speed =		30	km/h			
Catchup time = catchup distance/catch up speed						
catch up time=		6				
catch up time=		6.00	hours			
They will meet at		03:00	AM			
Express 	speed	=	90	km/h		
Time to catch up		=	6	hours		
D=Speed * time						
D=	90	*	6			
D=	540	miles				
Express 	will catch up	when it has traveled		540	miles