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Kilometres per hour

km/h is a unit of speed, read "kilometres per hour." An object travelling at a speed of 1 km/h would move 1 kilometre in one hour if the speed remained constant for that hour.

This unit is sometimes written kph, although in general this is casual rather than rigorous usage.

Examples of speeds in km/h

5 km/hWalking speed
20 km/hEasy bicycling speed
50 km/hResidential speed limit
80-90 km/hSpeed limit on a major road
110-120 km/hHighway speed
300 km/hHigh-speed railroad
1000 km/hAirliner cruising speed
40,320 km/hEarth's escape velocity

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