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Question. Swati's school is 3.6 km from her house. It took her 15 min to reach her school riding on her bicycle. Calculate the speed of the bicycle in m/s.
Solution.
Use the formula: Speed = Distance ÷ Time
$$\begin{aligned} \text{Speed of the bicycle} &= \frac{\text{Distance covered}}{\text{Time taken}} \\[8pt] &= \frac{3.6 \text{ km}}{15 \text{ min}} \end{aligned}$$
Convert km to m and min to s:
$$\begin{aligned} \text{Speed} &= \frac{3.6 \times 1000 \text{ m}}{15 \times 60 \text{ s}} \\[8pt] &= \frac{3600 \text{ m}}{900 \text{ s}} \\[8pt] &= 4 \text{ m/s} \end{aligned}$$
The speed of Swati's bicycle is 4 m/s .
