Question 435520
Freight train		x				200	miles			
Car		x	20			300	miles			
										
t=d/r	
200/x=300/(x+20)
Cross multiply										
200(x+20)=300*x	
200x+4000=300x				
300x-200x=4000				
100x=4000							
/100									
x=40Freight train	mph						
60 mph Car