A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour ?

A. 3.6 km/hr

B. 7.2 km/hr

C. 8.4 km/hr

D. 10 km/hr

Answer: Option B

Solution(By Examveda Team)

Speed :
$$\eqalign{ & = \left( {\frac{{600}}{{5 \times 60}}} \right){\text{ m/sec}} \cr & = {\text{ 2 m/sec}} \cr & = \left( {2 \times \frac{{18}}{5}} \right){\text{ km/hr}} \cr & = {\text{ 7}}{\text{.2 km/hr}} \cr} $$