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Question: Which is the average or maximum speed of a telematically sent message that a space probe can send? Is as simple as radio waves travel at the speed of light in a vacuum?

Context: I have been asked to make a first estimation about how much time is needed to send a space probe and then receive the signal.

I am supposing that the space probe is sent at $15 \ km/s$ but I have not idea of the telematic signal speed.

Thank you in advance!

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    $\begingroup$ This question appears to be better suited for Space Exploration. $\endgroup$ – e-sushi Mar 15 '14 at 18:49
  • $\begingroup$ Taking the speed of light will be a good approximation, as long as the signal is sent directly. $\endgroup$ – Gerald Mar 16 '14 at 0:23
  • $\begingroup$ Marc, do you want to know the average or the maximum, or both? This needs to be cleared up. $\endgroup$ – called2voyage Mar 17 '14 at 15:08