Question

A car covers a distance of $160\text{km}$ in $2\text{h}$, and another $80\text{km}$ in the next $1\text{h}$. Calculate the car's average speed in ${\text{m s}}^{-1}$.

• A. 22.22

Answer 1

The correct option is A 22.22
Total distance covered by the car $=160+80=240\text{km}$
Total time taken $=2+1=3\text{h}$

$⟹$ Average speed

$=\frac{\text{Distance covered}}{\text{Time taken}}=\frac{240}{3}$

$=80\text{kmph}$

Converting to ${\text{m s}}^{-1}$,
$\Rightarrow 80\text{kmph}=80\times \frac{5}{18}$
$=22.22{\text{m s}}^{-1}$