The same as Jupiter's distance from Earth.
Same as the Earth, 1 Astronomical Unit or 149.6 million kilometers.
The moon is far away because if it were to close then the gravity from earth would pull it in to use amd destroy the earth. And the moons graviy pull that it has on earth already affects the ocean,...
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6.2 million kilometers (closest) away from Earth.
Depends on the speed. At the speed of light, it takes a little over a second.