Question 1046672
x=hours on the bike
11-x=hours walking
9x+3(11-x)=69.  The speed times the number of hours equals the distance.
9x+33-3x=69
6x=36
x=6 hours on the bike and 5 hours walking.  ANSWER
That is 6*9=54 miles + 5*3=15 miles, and that sum is 69 miles