You have a wheel out of balance more than likely.
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The speed of the light is 3.10^8 miles per second.what is the speed in miles per hour
Eighty. That is what "miles per hour" means. It means how many miles you will go in one hour, if you keep going at that speed.
If an amusement park has a top speed of 607,200 feet per hour, then its speed in miles per hour is 115.
The car's average speed is 86.67 miles per hour.
Her average speed was 58 miles per hour.