Question 98413
1/4*5280=1320 feet ids the distance to cover.
distance=rate*time
1320=18*t
t=1320/18
t=73.33 sec for David to finish the race.
t=(1320/20)+3
t=66+3=69 seconds for John to finish the race.
John wins by 73.33-69=7.33 seconds.