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May 26th, 2013, 05:22 PM   #1
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Related Rates

I've done this problem so many times and I don't understand what i'm doing wrong. The problem is...

At noon, ship A is 20 nautical miles due west of ship B. Ship A is sailing west at 25 knots and ship B is sailing north at 16 knots. How fast (in knots) is the distance between the ships changing at 3 PM? (Note: 1 knot is a speed of 1 nautical mile per hour.)
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May 26th, 2013, 06:02 PM   #2
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Re: Related Rates

Let d(t) be the function of distance between the two ships in terms of t hours past noon:

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