the distance travelled by a car in 30 mins. is 18 km. find its speed in km/hr

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Solution

$s p e e d = \frac{d i s \tan c e}{t i m e} d i s \tan c e = 18 k m t i m e = 30 m i n s = \frac{30}{60} h r s = 0.5 h r s \Rightarrow s p e e d = \frac{18 k m}{0.5 h r s} = 36 k m / h r$

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