A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?
3.6
7.2
8.4
10
Explanation:
| Speed =$ \left(\dfrac{600}{5 \times 60} \right) $m/sec. |
= 2 m/sec.
Converting m/sec to km/hr => m/sec =$\left(x \times\dfrac{18}{5}\right)$
| =$ \left(2 \times\dfrac{18}{5} \right) $km/hr |
= 7.2 km/hr.