Question 447456
Freight train	x	---360	miles			
Express 		x+20---			600	miles			
360/x=600/(x+20)
Cross multiply										
360(x+20	)=600*	x	
360x+7200=600x				
600x-360	x=7200				
240x=7200							
/240									
x=30 mph	Freight train							
50 mph	Express 	

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