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## Homework Statement

There is a single two ane road connecting the Keys with the mainland. The south-

bound lane must remain open for emergency vehicles, so only one lane is available for

evacuation. In summer, 100,000 residents live on the Keys. Past data taken on the

bridge that connects the Keys to the mainland suggest that cars, during emergencies,

typically hold three people, move no faster than 8 km/hour, and maintain a spacing of

about 10 metres (one car length of 9.2 metres plus 0.8 metres).

(b) How long will it take to evacuate completely these people from the Keys?

(c) In your answer to (b), does it make any difference if all cars leaving the Keys enter

the one open lane of the two-lane road at one single location or if the cars leaving

the Keys enter the one open lane of the two-lane road at multiple locations along

the road? Explain. [Hint: think of the same situation on Highway 401 during

Toronto's rush hour.]

(d) You have to issue the evacuation order in time for a complete and safe evacuation.

If the hurricane, approaching Key West from the southwest, follows a straight path,

where would it be located geographically at the time you issue the evacuation order

## Homework Equations

No equation were given.

## The Attempt at a Solution

Since there are 100 000 thousands people, and 3 people per car, it comes out to 33333 cars because 100000/3= 33333

0.8 meters distances between cars, makes 0.8 x 33333 = 80 000

80 000 / 1000

I'm having trouble figuring out how long the distance is the cars have to travel.