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36. Multiple choice question XXXVI

A bus travels the first one third distance at a speed of

$10\ kmh^{-1}$ . The next one third distance at

$20 kmh^{-1}$ and the last one third distance at

$60 kmh^{-1}$ . The average speed of the bus is

$16\ \frac{km}{hr}$
$18\ \frac{km}{hr}$
$9\ \frac{km}{hr}$
$48\ \frac{km}{hr}$

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