Max. speed that a space probe can communite with the Earth? [closed]

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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closed as unclear what you're asking by e-sushi, Gerald, Eduardo Serra, called2voyage♦Mar 17 at 15:08

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

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