In order to solve this problem, use the following equations and steps shown: \begin{align} &\cssId{Step1}{v = ω \frac{d}{2}}\\[3px] &\cssId{Step2}{v = n \frac{2π}{60} \frac{d}{2}}\\[3px] &\cssId{Step3}{v = 3600 \frac{2π}{60s} \frac{0.42 m}{2}}\\[3px] &\cssId{Step4}{v = 79.17 m/s}\\[3px] &\cssId{Step5}{v = 79.17 \frac{m}{s} \frac{3600 s}{1 h} \frac{1 km}{1000 m} = 285 km/h}\\[3px] \end{align}