The distance is the same that was covered.
Distance is speed multiplied by time.
Mr O takes 30 minutes and Mr Gordon takes 1 hour.
So the speed of Mr O is given by:
[tex]\text{Speed}=\frac{10.5\operatorname{km}}{1hr}=10.5\operatorname{km}\text{ /hr}[/tex]Convert the speed in meter per second.
[tex]S_O=10.5\times\frac{5}{18}=\frac{35}{12}m\text{ /s}[/tex]The speed of mr G is:
[tex]S_G=\frac{10.5}{0.5}=21\operatorname{km}\text{ /hr=}\frac{35}{6}m\text{ /s}[/tex]So the difference between the speeds is:
[tex]\frac{35}{6}-\frac{35}{12}=\frac{35}{12}=2.9166667\text{ m/s}[/tex]So Mr O is 2.9167 m/s faster than Mr Gordon.
