Question 1069520
<pre>
                 SPEED         TIME        DISTANCE
LEWIS             60            7           420
CLARK             50           {{{420/50}}}       420

</pre>


The information about Lewis is not too important.  Only Clark's information is.
His amount of travel time in hours was  {{{420/50=42/5=8&2/5}}},  8 hours 12 minutes.


If he departed at 8:00AM then he arrived 4:12PM.