00:01
All right, to start this problem, i'm just going to set up a formula.
00:04
We have x, y, and l.
00:07
And because we have a right angle in here, my formula is x squared plus y squared equals l squared.
00:14
And so they even tell you that i'm assuming the first train is the one that's on the right side.
00:22
So that's x equals 22.
00:25
And the one that's north is 58 .5.
00:32
That i want to find the distance between the two of them, and i'm just doing the pythagorean theorem, and i'm using a calculator because i don't even know what 58 .5 squared is.
00:43
And when i add it to the 22 squared, i get 3906 .25, but then i have to square root to cancel off the square.
00:53
So if i try to square root it, oh, it actually gives me a really nice answer of 62 .5.
00:59
I was not expecting that.
01:02
58 .5 here.
01:04
So what we also know is dxdt because this person is traveling west.
01:11
So it is a negative because this value is getting smaller.
01:16
120.
01:19
Whereas d ydt is going away.
01:26
I'm just double checking...