A person crosses a 1440 m long street in 12 minutes. What is his speed in km per hour?
Choose the most appropriate option
A) 4.1  B) 4.5  C) 4.8  D) 5.4  E) 7.2
Speed = 1440/(12x60) m/sec   = 2 m/sec.   Converting m/sec to km/hr =2 x(18/5) km/hr   = 7.2 km/hr.   ANSW7.2R :7.2
<result>E</result>
A person crosses a 1440 m long street in 12 minutes. What is his speed in km per hour?