Calculating speeds of radio to a planet

[cinematic]

Hi! I need help with the method to approach a question, if I wish to calculate how long it will take for a radio message to reach a certain planet (just the general concept), what will be the key pieces of information I require?

I know I need: the distance from Earth to said planet
the distance traveled by the radio message (speed of light x journey time)

What else would I require? Any help is appreciated on this question. Thank you.

 

[Redbelly98]

The distance traveled is enough information to calculate the journey time.

 

[russ_watters]

Well, that and the speed of light, but you can look that up.

 

[Redbelly98]

Well, that and the speed of light, but you can look that up.

Well, yeah. There's also a good chance you'll need to know how to convert units.