1. The problem statement, all variables and given/known data The earth's radius is 6370 km, if you are sitting in a classroom on the equator how quickly would you be traveling? If you were in NY which has a latitude of 41 degrees N, how quickly would you be traveling? 2. Relevant equations 2(pi)r=circumference 3. The attempt at a solution I understand that you need to find the circumference and divide it by 24(hours). This gives you km/hr. So at the equator you would be going t about 1.67 * 10^3 km/hr. I don't understand how to find the circumference at 41 degrees N.