Question

Express the following speed in $km/hr$:

$12\frac{1}{2}m/s$

Answer 1

Converting the speed in $\mathit{k}\mathit{m}\mathbf{/}\mathit{h}\mathit{r}$

$12\frac{1}{2}m/s=\frac{12\times 2+1}{2}=\frac{25}{2}m/s$

We know that, $1km/hr=\frac{5}{18}m/s$ and

$1m/s=\frac{18}{5}km/hr$

$\Rightarrow \frac{25}{2}m/s=\frac{25}{2}\times \frac{18}{5}km/hr$

$\Rightarrow 5\times 9km/hr=45km/hr$

Hence, $12\frac{1}{2}m/s$ can be expressed as $45km/hr$.