mph is speed and kilometer is distance. if you're saying kilometer per hour the answer is 80.47kph.
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67,108.09 mph
93.2 mph
The impact speed for each car is 50 mph. During the crash, both cars are accelerated from a speed of 50 mph to zero, hence the impact speed is 50 mph. The relative speed between each car, however, is 100 mph.
574.8 kmph = 357.1642 mph
131 mph = 210.8 kph