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37. Multiple choice question XXXVII

A bus travelling the first one-third distance at a speed of

$10\ \frac{km}{hr}$ , the next one fourth at

$20 \frac{km}{hr}$ and the remaining at

$40 \frac{km}{hr}$ . The average speed of the bus is nearly

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

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