A person crosses a 750 m long street in 5 minutes, What is his speed in km per hour?

Question: A person crosses a 750 m long street in 5 minutes, What is his speed in km per hour?

Solution:
Speed = 750/(5 × 60) m/sec
= 2.5 m/sec
= 2.5 × (18/5) km/h
= 9 km/h