There really isn't a way to know without first picking a reference point. For example, the speed of a runner or a car is relative to the speed of the Earth's surface. The speed of the Sun relative to our local standard of rest (determined by stars in our 'neighborhood') is only about 43,000 miles per hour, however relative to the rest of our galaxy the speed of the sun is in the neighborhood of 483,000 miles per hour. If galactic motion in the Universe is considered then the speed would be astronomical, potentially faster than the speed of light since space-time is still expanding (another example of the relativity of speed: even though we are going faster than light relative to the universe, relative to our particular region of space-time we are stationary)
That depends how many hours you travel at that speed.
60 miles
You are traveling at 15 miles per hour.
55 miles
An average speed of 53,979 miles per hour
34.09 miles per hour.
Your average speed is 7.5 miles per hour.
75 miles per hour = 110 feet per second
55 miles
As many as you want. More miles will take more time. For every hour you spend doing it, you can travel 70 miles.
22.5 miles per hour.
The Harrier jet can travel at up to 689 miles per hour.