Question 1097682
This analysis is changed slightly to use just one variable.  The passenger train traveled here for x hours and freight train traveled just one hour longer.
<pre>
                 SPEED          TIME         DISTANCE
Freight           60            x+1          60(x+1)
 
Passenger         90            x            90x

Total                                         540
</pre>
You have just a single equation to solve:
{{{60(x+1)+90x=540}}}