question_answer

A motor car goes from Mumbai to Pune at a speed of \[20\text{ }km/hr\] but returns from there at a speed of \[30\text{ }km/hr.\] The average speed of the car for the entire journey is -

A)  26 km/ hrs                   

B)  25 km/hrs

C)  24 km/hrs                    

D)  23 km/hrs

Correct Answer: C

Solution :

        Average speed \[=\frac{60+60}{5}=\left( \frac{Total\text{ }distance}{Total\text{ }time} \right)\] \[=\,\,\,\frac{120}{5}\,\,\,\,\,\underline{\mathbf{24}\,\mathbf{km/hr}}\]