A person crosses a 720 m long street in 12 minutes. What is his speed in km per hour?
Choices.
A) 3.6  B) 4.5  C) 4.8  D) 5.4  E) 5.5
Speed = 720/(12x60) m/sec   = 1 m/sec.   Converting m/sec to km/hr =1 x(18/5) km/hr   = 3.6 km/hr.   3.6NSWER :3.6
<result>A</result>
A person crosses a 720 m long street in 12 minutes. What is his speed in km per hour?