Kate B.

# At a given moment, a plane passes directly above a radar station at an altitude of 8 km going 600 km/h. How fast is the distance between the plane and the radar station changing 36 seconds later?

I have all the grunt work of this problem done, I found the derivative, I just don't understand how to solve for x. I know it has something to do with a proportion to an hour, but I can't figure it out in order to plug it into my function.

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Kate B.

Okay, so to solve for x, I just divide the 600km by 3600 and multiply that number by 36 seconds? Or am I interpreting that wrong. Everything else you said I already had, which is reassuring!!
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09/15/20

JACQUES D.

tutor
You are converting 600 km/hr to m/s, then multiplying by seconds. Yes. Watch units.
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09/15/20

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