Question

A tortoise moves a distance of 100 metres in 15 minutes. What is the average speed of tortoise in km/h?

Answer 1

Distance (d) = 0.1 km
$$\begin{gathered} \mathrm{Time}\left(t\right)=\frac{15}{60}\mathrm{hr} \\ =0.25\mathrm{hr} \end{gathered}$$
So, we can calculate the speed as:
$\mathrm{Average}\mathrm{speed}=\frac{\mathrm{Total}\mathrm{distance}\mathrm{travelled}}{\mathrm{Time}}$
Average speed for the entire journey:
$$\begin{gathered} =\frac{0.1}{0.25} \\ =\boxed{0.4\mathrm{km}/\mathrm{hr}} \end{gathered}$$