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The kilometre per hour is a unit of speed, expressing the number of kilometres travelled in one hour.The unit symbol is km/h or, rarely, km·h−1; however, in some English-speaking countries it is also referred to as kph, especially within the generations that went through metrification or still use Imperial units or U.S.customary units.Worldwide, it is the most commonly used unit of speed on road signs and car speedometers.

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