The Earth spins on it axis once per stellar day (86,164.098903691 s, relative to the fixed stars), a little longer than one mean solar day (what you usually think of as a day, equal to 86,400 s, which is relative to the apparent motion of the sun in the sky). The Earth has an average radius of about 6378 km.
A. Use the length of one stellar day to find tangential (linear) speed of someone standing on the Earth's equator.
B. Newark, OH is located at a latitude of 40 degrees (North of the Equator). Find you tangential speed around the earth.