Question 985215
<pre>

rate     time     distance
25.4     t+x       16.2

</pre>


If t was expected time and x was the excess time, you have {{{t+x=1/2}}}.


This system can be formed:
{{{system((25.4)*(t+x)=16.2,t+x=1/2)}}}


Two linear equations in the variables, t and x;
both can be found.  These as set with the equations, will be in hours  (actually fractions of an hour).