A man riding his bicycle covers 150 meters in 25 seconds. What is his speed in km per hour ?

A man riding his bicycle covers 150 meters in 25 seconds. What is his speed in km per hour ?
[A]20
[B]23
[C]21.6
[D]25

21.6
$Speed = \frac{150}{25} = 6 m/s$
$= 6\times \frac{18}{5} = \frac{108}{5} = 21.6 km/hr$
Hence option [C] is correct answer.

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