Satellite Physics problem?

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PPK

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The speed of light is approximately 3.0 x 10^8 (that's 30 000 000) m/s.
v = d/t so t = d/v
time is distance traveled divided by speed

However, remember that geosynchronous satellites orbit at the equator, and your reciever is at the pole, so you have to factor in the extra distance the signal has to travel using the Pythagorean theorem (with 42164000m on one side and 6378100m (the radius of the earth) on the other, where signal length is the hypotenuse).
 
A communication satellite in geosynchronous orbit remains above a single point on the Earth's equator as the planet rotates on its axis.

The satellite relays a radio signal from a transmitter near the North Pole to a receiver, also near the North Pole. Traveling at the speed of light, how long is the radio wave in transit?

I solved that the radius is 42164000 m, but I don't know how to find the signal time.
 
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