00:01
So we know the stream is traveling at three kilometers per hour.
00:08
And we know that the river is, and this is not going to be to scale by any means, that this river is a half a kilometer wide, and this is per hour.
00:21
And the boat can travel 20 kilometers per hour.
00:24
So with that current going this way, we know that the boat will need to go off on an angle.
00:32
And it is traveling at a vector of, or the magnitude of 20 kilometers per hour.
00:40
And again, so you can see that these are not to scale by any means.
00:43
And we need to know what angle this needs to be for this is the resultant factor.
00:47
This resultant vector is that it aims this way and that it ends up having the current push it back and it ends up going straight.
00:58
So it has to veer off to the left per se.
01:00
So let's figure out what this angle is.
01:03
And so we can see in this right triangle situation that this is an opposite over hypotenuse.
01:08
So the sign of that angle is equal to the opposite over the hypotenuse, or the angle is the inverse sign of 320s...