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)

$$\eqalign{ & {\text{Speed}} = {\frac{{600}}{{5 \times 60}}} {\text{ m/sec}} = 2{\text{m/sec}} \cr & {\text{Converting}}\,{\text{m/sec}}\,{\text{to}}\,{\text{km/hr}} \cr & = {2 \times \frac{{18}}{5}} {\text{ km/hr}} \cr & = 7.2\,{\text{ km/hr}} \cr} $$