A runner 2/3 of a 5 kilometer race in 21 minutes. They ran the entire race at a constant speed. How long did it take to run the entire race? How many minutes did it take to run 1 kilometer?

Answer 1

2/3)(5)=10/3 km in 21 minutes

(3/2)(10/3) =5 km in (3/2)21=31.5 minutes for 5 km

31.5/5 = 6.3 minutes for 1 km