A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour? Choose the correct answer:  A) 3.6  B) 7.2  C) 8.4  D) 10  E) 11
Speed =(600/5*60)m/sec.   = 2 m/sec.   Converting m/sec to km/hr   =(2*18)/5	km/hr   =7.2 km/hr.   Answer:7.2
<result>B</result>
A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?