A person crosses a 1080 m long street in 12 minutes. What is his speed in km per hour?  Answers:
A) 4.1
B) 4.5
C) 4.8
D) 5.4
E) 5.5
Speed = 1080/(12x60) m/sec   = 1.5 m/sec.   Converting m/sec to km/hr =1.5 x(18/5) km/hr   = 5.4 km/hr.   ANSWER :5.4
<result>D</result>
A person crosses a 1080 m long street in 12 minutes. What is his speed in km per hour?