Hello all! M and K here! The Earth, spins at variable rates depending on your geographical position. The Earth spins the fastest at the equator. This speed is 1040mph or 1525.333 feet per second from the West to the East. As you travel away from the Equator towards the poles, the slower the Earth spins.
Driving for 50 miles (At 60mph)to a fixed destination, Westbound at the equator would be FASTER than traveling that same 50 miles, Westbound, in say, Northern California at the same speed!