When it is $10$:$00$ AM in Seattle, it is $1$:$00$ PM in New York City. Using this information, you can calculate some rough physical parameters for the Earth. Calculate $($a$)$ the rotational speed of the surface of the Earth, $($b$)$ the circumference of the Earth, and $($c$)$ the radius of the Earth. Consider the Earth to be a sphere, regardless of what the internet says.