0.62137 (rounded)
55 kilometers is very fast for one hour. 88.51 kilometers per hour = 55 miles per hour. Wow that is really fast. Imagine driving that fast.
one kilometer = 0.6214 miles so for your question 51 kilometers = 51*0.6214 = 31.6 miles
10,000km per hour is the same as 6,213.71 miles per hour.
Suggestion: Convert miles to kilometers, then it should be easy to compare. One mile is about 1.6 kilometers.
There are 1.609344 kilometres in one mile. Therefore, 35 miles per hour is equal to 35 x 1.609344 = 56.32704 kilometres per hour.
3.54 miles per hour...
A little more than 15 degrees per hour. How fast that is in miles per hour depends on the latitude; at the poles it's zero, but at the equator it's around a thousand.
68.35 mph. 1 kilometer is equal to .62137 miles. To convert from kilometers to miles, simply multiply the kilometers by .62137
One mph = 1.609 kph
You'll travel 100 kilometers in an hours time. In miles, it's 62.1371 miles. So you would travel 100 kilometers in one hour, or 62.1371 miles, or 91.1344 feet per second, or 27.777.... meters per second.
2.3 miles per hour.
Mach one is the speed of sound, which is about 761.2 miles per hour (340.3 meters per second). Mach two is twice the speed of sound, which is about 1,522.4 miles per hour (680.6 meters per second).