Question 517047
Freight Train		x				240	miles			
Passenger Train		x+	18			330	miles			
										
t=d/r										
240	/	x	=	330	/	(	x+	+	18	)
Cross multiply										
240	(	x	+	18	)	=	330	*	x	
240	x	+	4320	=	330	x				
330	x		-240	x	=	4320				
90	x	=	4320							
/	90									
x 	=	48	Freight Train	mph						
		66	Passenger Train	mph