If the speed limit is 55 mph, it converts to approximately 88.5 km/h. To convert miles per hour (mph) to kilometers per hour (km/h), you can use the conversion factor 1 mph = 1.60934 km/h. Therefore, 55 mph multiplied by 1.60934 gives you 88.5 km/h. This means that if you are driving at 55 mph, you are traveling at about 88.5 km/h.
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