A person crosses a 600m long street in 4 minnutes. What is his speed in km per hour?	Pick one:
A) 5.8km/hr
B) 7.2km/hr
C) 9km/hr
D) 2.5km/hr
E) 3km/hr
Speed = 600/4*60 = 2.5m/sec   =2.5*18/5= 
<gadget id="calculator">2.5*18/5</gadget>
<output>9</output>
9km/hr   Answer is 9km/hr
<result>C</result>
A person crosses a 600m long street in 4 minnutes. What is his speed in km per hour?