Related Rates: Helicopter Distance and Direction

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Related rates, roflcopter!

Homework Statement



A helicopter takes off from a landing pad at 10:48am and travels eastward at a speed of 120km/h. A second helicopter traveling south at 150km/h is planning to land at 10:59am,

How fast is the distance between them chaging at 10:50am and is the distnace between them increasing or decreasing at this instant...

The Attempt at a Solution



http://img228.imageshack.us/img228/9103/10095447sb4.jpg​
 
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Is it bad that I lol'ed? Guess I'm a nerd.
 
JFonseka said:
Is it bad that I lol'ed? Guess I'm a nerd.
sooo how about the problem? or is that your nice way of saying it's completely wrong?
 
There are two things I don't understand about this problem. First, when finding the nth root of a number, there should in theory be n solutions. However, the formula produces n+1 roots. Here is how. The first root is simply ##\left(r\right)^{\left(\frac{1}{n}\right)}##. Then you multiply this first root by n additional expressions given by the formula, as you go through k=0,1,...n-1. So you end up with n+1 roots, which cannot be correct. Let me illustrate what I mean. For this...
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