00:01
Hello and welcome to this video where we're going to take a look at a work problem.
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We have this one.
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Peter can clean the classroom floor in three hours.
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When his assistant helps him, the job takes two hours.
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How long will it take the assistant to do it by himself? and so what we want to do is kind of label a few things here.
00:16
So we're going to start off with peter the assistant and then peter plus the assistant.
00:22
Now peter can do the job in three hours.
00:26
His assistant, we don't know how long he can take, or it takes the assistant to do the job, so that's a question mark.
00:32
Or perhaps, better yet, x.
00:35
It's an unknown.
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We have to figure it out.
00:37
And then when they work together, it takes them two hours.
00:40
And this makes sense because, you know, there's two of them, and so they're splitting the work, so it should be a little bit faster here.
00:46
Now, the way we go about solving these work -related problems is asking ourselves what gets done in one unit of time.
00:54
So in other words, we're going to ask ourselves what gets done in one hour.
01:00
That's the big question...