A warehouse cart has a distance counter that shows the total distance the cart has travelled since it was switched on. At the start of a delivery the counter reads 100 m. The delivery takes 80 s, and at the end of the delivery the counter reads 300 m.
Which of these is the cart's average speed during the delivery?
1.25 m/s1.25\ \mathrm{m/s}1.25 m/s
3.75 m/s3.75\ \mathrm{m/s}3.75 m/s
2.50 m/s2.50\ \mathrm{m/s}2.50 m/s
5.00 m/s5.00\ \mathrm{m/s}5.00 m/s