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Question:

If you are traveling at 55 mph in a 30-foot vehicle, you should leave how many seconds of following distance?

A 4 seconds
Explaination

One second for ten feet of car, plus an extra second if you're going over 40 mph, is the calculation for following distance. So, if you're driving a 30-foot vehicle at 55 mph, you should leave a 4-second following space.