What is a good estimate for the typical speed of a person cycling?
1.5 m s−11.5\text{ m s}^{-1}1.5 m s−1
6 m s−16\text{ m s}^{-1}6 m s−1
25 m s−125\text{ m s}^{-1}25 m s−1
90 m s−190\text{ m s}^{-1}90 m s−1