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Unformatted text preview: o eliminate one of them for physical reasons.
Let’s work another example or two. Example 2 Two cars start out at the same point. One car starts out driving north at 25 mph.
Two hours later the second car starts driving east at 20 mph. How long after the first car starts
traveling does it take for the two cars to be 300 miles apart?
Solution
We’ll start off by letting t be the amount of time that the first car, let’s call it car A, travels. Since
the second car, let’s call that car B, starts out two hours later then we know that it will travel for
t  2 hours.
Now, we know that the distance traveled by an object (or car since that’s what we’re dealing with
here) is its speed times time traveled. So we have the following distances traveled for each car. distance of car A : 25t
distance of car B : 20 ( t  2 )
At this point a quick sketch of the situation is probably in order so we can see just what is going
on. In the sketch we will assume that the two cars have traveled long enough so that...
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This note was uploaded on 06/06/2012 for the course ICT 4 taught by Professor Mrvinh during the Spring '12 term at Hanoi University of Technology.
 Spring '12
 MrVinh

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