Related Rates Help

Test Preparation AP Test Preparation
1

<p>Hi, I need help with this problem. This is probably a really easy problem, but I honestly can't figure out how to do it. I tried to draw a figure but I think it does not match the word problem. The problem is here:</p>

<p>At noon, ship A is 100 Km west of ship B. Ship A is sailing south at 35 km/h and ship B is sailing north at 25 km/h. How fast is the distance between the ships changing at 4:00pm.</p>

<p>Any help will be greatly appreciated. You do not have to solve if you dont want to.. I just want to know what equation you used for the relation.</p>

<p>Thanks in Advance.... :)</p>

2

<p><a href="http://xs109.xs.to/xs109/06462/rates.png%5B/url%5D"&gt;http://xs109.xs.to/xs109/06462/rates.png&lt;/a&gt;&lt;/p>

<p>and then use the pythagorean theorem where
a = distance A travels by 4:00 + distance B travels by 4:00
b = 100 km
c = sqrt( a² + b² )</p>

3

<p>Thanks grark...My diagram looked nothing like that.</p>