radar signal from Earth to Mercury and back

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Can you guys help me figure out how long it would take for a radar signal to travel to mercury and back when Mercury is at its closest point to Earth?

[swansont]

The two orbital radii can be found with http://www.google.com/

 

The speed of the radar signal will be c = 3 x 10^8 m/s

[5614]

And then simply: time = distance / speed