NCERT Exemplar XII — task. Science CBSE, Class 9.

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A motorcyclist drives from A to B with a uniform speed of

$30\ km\ h^{-1}$ and returns back with a speed of

$20\ km\ h^{-1}$ . Find its average speed.

The formula to calculate the average speed is,

$Average\ speed\ =\ \frac{Total\ distance}{Total\ time}$
$Average\ speed\ =\ {Total\ time} \times {Total\ distance}$
$Average\ speed\ =\ \frac{Total\ time}{Total\ distance}$

Average speed $=$

$Km\ h^{-1}$

(Note: Enter your answers with no decimal places)

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