Express 15 m s-1 in km h-1.
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1 m s-1 = 3.6 km h-1
15 m s-1 = 3.6 x 15 = 54 km h-1
So, 15 m s-1 = 54 km h-1.
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Express 36 km h-1 in m s-1.
A car travels a distance of 15 km in 20 minute. Find the speed of the car in:
(i) km h-1
(ii) m s-1
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