Swami walks to his school which is at a distance of 4 km from his home in 30 minutes. On reaching he finds that the school is closed and comes back in his friend’s vehicle to home in 10 minutes. His average speed in km/h is _____________.

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$24 km / h$

$8 km / h$

$16 km / h$

$20 km / h$

answer is D.

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Detailed Solution

$\begin{matrix} Walking speed of Swami = \frac{4}{\frac{30}{60}} = 8 km / h \\ Swami' s speed on his friend' s vehicle = \frac{4}{\frac{10}{60}} \\ = 24 km / h \\ Average speed = \frac{24 + 8}{2} = 16 km / h \end{matrix}$

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