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

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Solution

$D e a r S t u d e n t, G i v e n, d = 3 k m, t = 5 m i n = 5 \times 60 = 300 s (a) d = 3 k m = 3000 m = 300000 c m S p e e d = \frac{d}{t} = \frac{300000}{300} = 1000 c m / s (b) d = 3 k m = 3000 m S p e e d = \frac{d}{t} = \frac{3000}{300} = 10 m / s (c) d = 3 k m, t = 5 m i n = \frac{5}{60} = \frac{1}{12} h S p e e d = \frac{d}{t} = \frac{3}{\frac{1}{12}} = 36 k m / h R e g a r d s$

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