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Question:

At 55 mph on a two-lane road, you will need _________ to safely pass the vehicle ahead of you.

A
Explaination

On a two-lane road, you must complete the pass before you risk colliding with an oncoming vehicle. At 55 mph, your vehicle will travel over 800 feet in just 10 seconds. So will an oncoming vehicle. Thus to complete the pass in 10 seconds, you will need over 1,600 feet – more than three-tenths of a mile. And at a distance of 1,600 feet, it is hard to judge how fast an oncoming vehicle is traveling.