The phrase "how fast is00 km" appears to be unclear or incomplete. If the question is about the speed equivalent of 100 kilometers per hour (km/h), then: 100 km/h equals approximately 62.14 miles per hour (mph). This speed conversion comes from the fact that 1 km/h = 0.621371 mph, so multiplying 100 km/h by this factor gives about 62.14 mph.
If the query was different or needs clarification, please specify the context or details for a more precise response.
