Answer :
Answer and Explanation:
The speed of the mercury is exactly 2/3 of the orbital speed, We know that mercury rotate ones in 58.647 days and the orbital speed is 87.97 days so from here the mercury speed is 2/3 of the orbital speed.
The speed of mercury [tex]=\frac{2}{3}[/tex] orbital speed this is the relation between the mercury speed and orbital speed