# CAHSEE Math 2.3 Measurement and Geometry

CAHSEE Math Measurement and Geometry Drill 2, Problem 3. How far apart in kilometers is the destination away from the starting point?

 CAHSEE Math Measurement and Geometry Language English Language Measurement and Geometry Conversions

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Ok, what is this question asking?

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It’s one of those distance-time-rate problems that we hold so near and dear to our hearts.

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Since we know miles per hour, and we’re given another piece of information that’s

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in terms of minutes…

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…it would probably be a good idea to get everything on the same page.

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If our Trekkie friend is going 45 miles per hour, how fast is he traveling per minute?

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Well, he’s going 45 miles in 60 minutes…

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…so we’re looking at 45-sixtieths… or three-fourths… of a mile in one minute.

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It takes him 12 minutes to reach his destination…

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…and 12 times 3/4 equals 9… so he traveled 9 miles.

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But we can’t live long and prosper just yet. Let’s not fall for choice C, which

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is clearly trying to catch us in a Vulcan trap.

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The question is asking for kilometers, not miles.

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We’re told that 1 mile is about 1.6 kilometers…

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…so let’s multiply 9 by 1.6… to get 14.4 kilometers.

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