A man crosses a 600 m long street in 5 minutes. What is his speed in km per hour?
Options:  A) 7km/hr  B) 7.2km/hr  C) 5.2km/hr  D) 10km/hr  E) 5km/hr
Speed =600/5 *60 = 2 m/sec   Converting m/sec to km/hr .   =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 man crosses a 600 m long street in 5 minutes. What is his speed in km per hour?