00:01
For this exercise, we're going to first write down a rule that each of them is from anne's place.
00:10
And, okay, we have ann riding your bike to marines at a constant speed of 20 kilometers per hour.
00:25
And 18 kilometers for the other partner.
00:31
So that's going to be 38 kilometers per hour.
00:36
So we're going to call this t.
00:41
And that's minutes divided by 60.
00:46
Well, then in the front line, we're going to put 57.
00:50
So it's going to be 57 minus 30 t over 60 equals d after o.
01:06
And let's see this.
01:09
T equals minutes after 9.
01:16
And this is am.
01:20
Okay, so that was part a.
01:22
Now let's look clearly at part b.
01:26
And we're gonna slow this down for a second.
01:30
By drawing.
01:31
So i'm gonna use a ruler.
01:35
We have our y -axis, and this is going to be simply in the first quadrant.
01:41
And we have our alternative axis.
01:46
Let's play the one.
01:49
Some specific markers here just to demonstrate our constraints.
02:02
Furthermore, we will do that here.
02:06
And now that's going to be 5 kilometers apart.
02:13
So we need this to be about 10, 20, 30, 40, 50, 60.
02:20
Time is going to be here.
02:23
For time, d here for distance, and this is going to be 20, 38, 15 minutes.
02:36
So 15, 30, 45, 60, 75, 90, 90, 105, 120, 135, 15, 15, 15, 20, 120, 135.
02:54
Okay, and then this will be 510, 5, 10, 15, 20, 25, 30, 35, 40, 50, 50, 50, 55, 50, 50, 55, 50, this is going to expand slightly here so this will be 10 20 30 40 50 60 and now we can say the first hour they traveled 38 kilometers so in 60 minutes we need them to be at 38 okay so that's now our linear projection from 9 o 'clock...