Question

The speed of a car is 18 m/s. Express this speed in km/h.

Answer 1

$1\frac{m}{sec}=\frac{\frac{1}{1000}km}{\frac{1}{3600}hr}$

$\therefore 1\frac{m}{sec}=3.6\frac{km}{hr}$

$\therefore 18\frac{m}{sec}=18\times 3.6\frac{km}{hr}$

$=64.8\frac{km}{hr}$

Thus, the speed of the car is 64.8 km/hr.