A person crosses a 600m long street in 5minnutes. What is his speed in km per hour?  Choose the correct choice:
A) 5.8km/hr
B) 7.2km/hr
C) 9km/hr
D) 2.5km/hr
E) 3km/hr
Speed = 600/5*60 = 2m/sec   =2*18/5= 
<gadget id="calculator">2*18/5</gadget>
<output>36/5 = around 7.2</output>
7.2km/hr   Answer is 7.2km/hr
<result>B</result>
A person crosses a 600m long street in 5minnutes. What is his speed in km per hour?