Post #2756465
2026-05-15 04:19 UTC
It’s not how far apart they are It’s how fast they are seperating. I’m not sure but the rate they are seperating might change as they get further apart due to the triangle or something? Otherwise yeah just a triangle.
Replies (1)
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@davetortoise@reddthat.com 2026-05-15 05:50
Rigourously overcomplicating the problem: Let dy = distance boy travels north in time dt, and dx = distance girl travels east in time dt. We know that dy = 5dx from the question, hence: | | dy | | |__ dx And the distance they separate dS in time dt is clearly the hypoteneuse. So we can write: dS = sqrt(dx^2 + dy^2) And divide through by dt: dS/dt = sqrt( (dx/dt)^2 + (dy/dt)^2 ) Simply gives the rate of separation dS/dt as 5.1 feet per second.