<PRE><B>Question 156552</B>
Let x = speed of the express train
Let y = speed of the freight train
An express train is 19mph faster than a freight train.
then {{{x=y+19}}}
The express train travels 420 miles in the same time that it takes the freight train to travel 300 miles
then {{{420/x =300/y}}}









</PRE>