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83% (01:09) correct
17% (02:27) wrong based on 6 sessions
Well, I had a really great diagram made up, but it will not let me post it!
Basically, I used two right triangles with known sides of 300 and 400. The hypotenuses run from X to Y. If you solve for the hypotenuses, they are 500', together they make the distance from X to Y 1000'.