Question 916960
Washington train		x		mph	-	225	miles			
Richmond train		x+	50	mph	-	375	miles			
										
t=d/r										
225	/	x	=	375	/	(	x+		50	)
Cross multiply										
225	(	x		50	)	=	375	*	x	
225	x	+	11250	=	375	x				
375	x		-225	x	=	11250				
150	x	=	11250							
/	150			mph						
x	=	75	Washington train	mph						
		125	Richmond train