Question

A motorcyclist drives from place $A$ to $B$ with a uniform speed of $30\text{km/h}$ and returns from place $B$ to $A$ with a uniform speed of $20\text{km/h}$. Find his average speed.

• A. $25\text{km/h}$
• B. $20\text{km/h}$
• C. $24\text{km/h}$
• D. $28\text{km/h}$

Answer 1

The correct option is C $24\text{km/h}$

We know that,

$\text{Average peed}=\frac{\text{Total distance}}{\text{Total time}}$

$\Rightarrow v=\frac{d+d}{d/30+d/20}=24\text{km/h}$

Hence, option $\left(C\right)$ is the correct answer.