A person crosses 600 m in 5 minutes. Find speed in km/hr.
Show Hint
Memorize the conversion factors: $1 \text{ km/hr} = \frac{5}{18} \text{ m/s}$ and $1 \text{ m/s} = \frac{18}{5} \text{ km/hr}$. This makes conversions between these common speed units very fast.