Question 1010253
<pre>
                speed        time        distance
early slow      60            t+2         d
late fast       90            t           d
</pre>

That make sense according to the description?  Hope so.



Now, you saw the variable assignments, and instead, MORE will be made.
<pre>
                speed        time        distance
early slow      r            t+h         d
late fast       R            t           d
</pre>


Known variables, r, R, h.
Unknown variables, t, d.



System of equations will be  {{{system(r(t+h)=d,Rt=d)}}}


Solve for a formula for d, only in terms of r, R and h.