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Mathematics 21 Online
OpenStudy (anonymous):

Two people start from the same point. One walks east at 9 mi/h and the other walks northeast at 5 mi/h. How fast is the distance between the people changing after 15 minutes?

OpenStudy (anonymous):

we'll need to break up the 5mi/h into components of east and north using pathagoreans therom: a^2 +b^2 = c^2 does that help?

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