Which planet rotates the slowest on its axis?

Venus

What is the Slowest Planet. Venus, which is floating higher each evening in twilight, low in the west, is the slowest-spinning body in the known universe. If you walked along a bike path that circles its equator, you'd only need to go four miles an hour to keep night from ever falling on Venus.

Venus

Explanation:

It rotates once every 243 days, by far the slowest rotation period of any of the major planets.

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the answer to this question is 3.