Question 1131716
Show all work as you solve the following problems and write complete answers, including appropriate units.

Mark left school and traveled toward his cabin on the lake.  Imani left school one hour later traveling 9 mph faster in an effort to catch up to him.  After four hours Imani finally caught up.  Find Mark's average speed
<pre>That other person is WRONG!!
Correct answer: {{{highlight_green(matrix(1,5, "Mark's", average, "speed:", 36, mph))}}}