A person crosses a 600 m long street in 5 minutes.What is his speed in km per hour?

Answer: (b)

\(Speed = \left ( \frac{600}{5 \times 60} \right )\) m/sec

= 2 m/sec

= \(\left ( 2 \times \frac{18}{5} \right )\) km/hr

= 7.2 km/hr.