Answer :
Divide and see how far they traveled in 1 minute.
Paul:
3.75 / 15 = 0.25 km in 1 minute
Lisa:
4.2 / 18 = 0.23 km in 1 minute
Carol:
3.2 / 12 = 0.27 km in 1 minute
Eric:
5.5 / 30 = 0.18 km in 1 minute
You are correct, Carol rode at the greatest speed.
Paul:
3.75 / 15 = 0.25 km in 1 minute
Lisa:
4.2 / 18 = 0.23 km in 1 minute
Carol:
3.2 / 12 = 0.27 km in 1 minute
Eric:
5.5 / 30 = 0.18 km in 1 minute
You are correct, Carol rode at the greatest speed.