Posted by **Becky** on Thursday, June 28, 2012 at 10:12pm.

If two planes leave the same airport at 1:00 PM, how many miles apart will they be at 3:00 PM if one travels directly north at 150 mph and the other travels directly west at 200 mph?

I understand that d = sqrt[300^2 + 400^2]

d = sqrt[250,000]

But im not sure how you get 500 from this point don't remember!! I used a calculator for [300^2 + 400^2] but not sure how to do the rest?

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