00:01
So the theme in this problem is that we have distance equals rate times time.
00:06
That seems really simple, but the rate is based off of two different situations.
00:12
One rate is going downstream.
00:17
So the theme is if you're going downstream, let's call it like the boat with the current.
00:26
There you go.
00:28
Boat plus the current.
00:30
So you're going faster.
00:33
I'll write boat plus current is a faster speed compared to the rate being the boat minus the current.
00:46
So they do tell you that you're going 180 miles.
00:51
And let's go ahead and write the rate as b plus c.
00:55
And then the time is, well, they don't actually tell you the time.
01:04
Okay.
01:05
But they do tell you that the current is two miles an hour.
01:09
So let's go ahead and change that c to be a two.
01:14
And they don't tell you the time when you're going with the current.
01:19
What they do tell you, though, is you go the same distance of 180, but this time it's a boat minus the current.
01:27
And it takes 12 hours longer to get there...