probably a wheel bearing, ball joint, tie rod end, or tire balance issue. A bad CV joint is possible but unlikely. a severely bent rim will also cause a shimmy but usually at a higher speed.
360 feet.
You have a wheel out of balance more than likely.
a lot
check the balancing on the tires.
It depends on the road conditions, as well the state of your brakes.
210/(the number of miles per hour it is done at) hours
If its a full hour of commercials 120, if it in brakes (usually last 3-5 minutes) 24- 40ish's
if you were to drive straight there it would be 27 hour drive with food and bathroom brakes
44 feet
Brakes must be able to stop a car at 20 miles per hour within 25 feet. This is very important for safety of pedestrians and drivers, as well as for the good of the car.
The answer depends on a number of factors. Among these are the condition of the brakes, the tyres, the road.
10 feet