A person crosses a 420 m long street in 5 minutes. What is his speed in km per hour?	Answers.
A) 5.2 km/hr. B) 8.2 km/hr. C) 7.2 km/hr. D) 3.2 km/hr. E) 5.04 km/hr.
E   5.04 km/hr.   Speed=(420/5 * 60) m/sec   = 1.4 m/sec.   Converting m/sec to km/hr   =(2*18/5) km/hr   = 5.04 km/hr.   Answer is 5.04 km/hr.
<result>E</result>
A person crosses a 420 m long street in 5 minutes. What is his speed in km per hour?