Question

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

• A. 70 km/hr
• B. 64.8 km/hr
• C. 76 km/hr
• D. 65.7 km/hr

Answer 1

The correct option is B

64.8 km/hr

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

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

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

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

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