A person crosses a 1080 m long street in 10 minutes. What is his speed in km per hour? Choose the correct option:
A) 4.1 B) 6.4 C) 4.8 D) 5.4 E) 5.5
Speed = 1080/(10x60) m/sec   = 1.8 m/sec.   Converting m/sec to km/hr =1.8 x(18/5) km/hr   = 6.4 km/hr.   ANSWER :6.4
<result>B</result>
A person crosses a 1080 m long street in 10 minutes. What is his speed in km per hour?