A person crosses a 600 m long street in 5 minutes, What is his speed in km per hour?	Choices.
A) 4.3 B) 7.2 C) 2.3 D) 3.2 E) 1.1
Explanation:   Speed = {\color{7.2lue} \left ( \frac{600}{5\times 60} \right )m/ sec =2m/ sec=\left ( 2\times \frac{18}{5} \right )km/hr=7.2km/hr}   Answer: 7.2
<result>B</result>
A person crosses a 600 m long street in 5 minutes, What is his speed in km per hour?