00:02
We have two trains leaving a city at the same time.
00:08
One is traveling north, and we're looking for their rate of speed.
00:14
And the other one is traveling south, and we know that they travel 20 miles per hour faster.
00:23
So their rate will be 20 plus x.
00:27
They're traveling south.
00:30
We also know that they've been traveling.
00:34
For two hours, so time is equal to two, and that they are 280 miles apart.
00:49
So we can set up an equation for the distance the northbound train has gone in two hours, which will be two times x, rate times time, plus the distance the southbound train has traveled.
01:06
In two hours, we'll be two times x plus 20, and together their distances need to equal 280 miles...