There is a group anxiously waiting to start their triathlon. They are in the sand getting ready for the first leg of the race. The swim! They have roped off a rectangle of the beach that is 200 yards long and 10 yards wide. The atheletes are packed in fighting for the front. If we assume that 10 atheletes can occupy 25 square feet, how many triathletes are competing?
a) 3450
b)6800
c)5000
d) 7200