Question 1159172

A river has a current speed of 5 miles per hour. A boat travels down river for 20 miles. It then makes the return trip up the river. If the return trip took 8 hours and 20 minutes longer than the trip down river, what is the speed of the boat in still water?
<pre>Correct answer: Speed of boat in still water: {{{highlight_green(matrix(1,2, 7, mph))}}}