A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?	Answers:
A) 7.9  B) 7.3  C) 7.8  D) 7.2  E) 7.1
distance = 600 meter   time = 5 minutes = 5 x 60 seconds = 300 seconds   Speed = distancetime=600300=2m/s=2×185 km/hr=365 km/hr=7.2 km/hr   Answer :7.2
<result>D</result>
A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?