Question 459803
Freight train		x---------230	miles								
Passanger train		x+20 ---------330	miles
t=d/r
time is same	
230/x=330/(x+20)			
							
230(x+20	)-330x=0
-100x+4600=0
-100	x	=	-4600

x= 46 mph speed of freight train
46+20=66 mph speed of passanger train