Question 1091608
45/60 = 75% 45 minutes is 75% of an hour (an hour has 60 minutes)
80*0.75 = 6 Luis walked 6 miles in 45 minutes
6/28 = 0.2143 and 60*0.2143 = 12.858 minutes. 
Kristin will catch up with Luis in just under 13 minutes.