A scooterist covers a distance of 3 kilometres in 5 minutes. Calculate his speed in:(a) centimetres per second (cm/s)(b) metres per second (m/s) (c) kilometres per hour (km/h)

As given, the distance covered by the scooterist $s=3\ km$

Time taken $t=5\ minute$

Therefore, speed $=\frac{distance}{time}=\frac{3\ km}{5\ minute}$

So, the speed:

$(a)$. In centimetres per second $(cm/s)$

$=\frac{3\times1000\times100\ cm}{5\times60\ seconds}$

$=1000\ cm/s$

$(b)$. Speed of the scooter in metres per second $( m/s)$:

$=\frac{3\ km}{5\ minute}$

$=\frac{3\times1000\ m}{5\times60\ s}$

$=10\ m/s$

$​(c)$ Speed of the scooterist in kilometers per hour $(km/h)$:

$=\frac{3\ km}{\frac{5}{60}\ h}$

$=\frac{3\times60}{5}\ km/h$

$=36\ km/h$

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Updated on: 10-Oct-2022

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