20. The radius of the Earth is accepted to be roughly 6400 cm.
4. How far, to the nearest km, do you travel in one complete rotation of the Earth?

  no more than 40,212 km

Step-by-step explanation:

We assume you intend the radius of the Earth to be 6400 km, not 64 meters.

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The distance you travel in one rotation depends on  your latitude. At the North or South pole, you simply turn in a circle on the spot, not going anywhere.

At the equator, the circumference of the "accepted" Earth is ...

  C = 2πr = 2π(6400 km) = 12800π km ≈ 40,212 km

If you are standing on the Equator, you will travel 40,212 km around the axis of rotation in one complete rotation of the Earth.

Comment on other contributors to your travel

Of course, there are additional motions, including the motion of the Earth in its orbit around the sun. In one day, that adds about 2,574,670 km* to your travels. The motion of the sun around the center of the galaxy adds even more than that. The motion of the galaxy will depend on your frame of reference.

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* assuming a circular orbit with a radius of 93 million miles and a year length of 365.25 days. When you want accuracy to the km, you need to specify these, and perhaps more if eccentricity is taken into account.

the 3rd on is correct

step-by-step explanation: