Marco can paddle his canoe at a rate of 6 miles per hour on unmoving water. However, today
Marco is canoeing down (with the current), and
then back up (against the current), a river that's
moving at a rate of 1 mile per hour, so the
current affects his rate of speed. If it takes Marco
6 total hours to go x miles downstream and then
return to his starting point, how far downstream
does he travel?
A) 1.25 miles
B) 2.5 miles
C) 5 miles
D) 17.5 miles