If the body travels $10\text{m}$ in $2\text{s}$, what is its speed in $\text{kmph}$?

The correct option is C $18\text{kmph}$
Given,
Distance = $10\text{m}$ and time = $2\text{s}$
We know :
Speed $=\frac{\text{Distance}}{\text{Time taken}}$

$\therefore$ Speed $=\frac{10}{2}=5{\text{m s}}^{-1}$

$=\frac{5\text{m}}{1\text{s}}$

$=\frac{5\times \frac{1}{1000}\text{km}}{1\times \frac{1}{60\times 60}\text{h}}$

$=\frac{5\times 3600}{1000}\text{kmph}$

$=18\text{kmph}$