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## Homework Statement

An airplane flying horizontally at an altitude of 3 miles and at a speed of 480mi/hr passes directly above an observer on the ground. How fast is the distance from the observer to the airplane increasing 30 seconds later?

## Homework Equations

## The Attempt at a Solution

can you check if this is right:

If the plane is moving at 480 mi/hr, use 30 seconds to compute how far it traveled. (480 miles/hour)(hour/60 minutes) = 8 miles/minute.

It can be seen that 30 seconds is half a minutes, so the plane would have flown half of 8 miles. You can probably do this, but 8/2=4.

If the plane were 3 miles overhead and travelled 4 miles away, the distance can be found as √(3²+4²). Compute 3². Compute 4². Add the two together. The number should be recognized as X².

rest i dont know