In a 100 meter race, Allen and Bruce reached the finish line in 12 seconds and 15 seconds, respectively. When Allen finished the race, how far was Bruce from the finish line? Assume that they each move at a constant rate.
Bruce rate 100m/15 s = 6 2/3 m/s
Allen was there 3 seconds before Bruce who still had to run 3 sec x 6 2/3 m/s = 20 meters