angular velocity is the same for all points on the earth except the poles.
There is either too much information or insufficient information.
Find the angular speed of a point on the Earth's surface.
Assume that radius of the Earth is 6400 km.
Every point on the Earth, except the two poles, turns though 360° every 24 hours.
. . Hence, the point moves: .
And the radius of the Earth is irrelevant.
If the speed is to be in kilometers per hour,
. . we should have been given the latitude of the point.
Assuming that point is on the Equator,
. . the circumference is: . km.
Then the point moves at: . km/hr.