A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour? Select the correct option.
A) 7.1  B) 7.2  C) 7.5  D) 7.4  E) 7.3
distance = 600 meter   time = 5 minutes = 5 x 60 seconds = 300 seconds   Speed = distance/time=600/300= 
<gadget id="calculator">600/300</gadget>
<output>2</output>
2m/s=2×18/5 km/hr=36/5 km/hr=7.2 km/hr   Answer is 7.2.
<result>B</result>
A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?