yego.me
yego.me
💡 Stop wasting time. Read Youtube instead of watch. Download Chrome Extension

Length of a trip in 24 hour time | Math | Khan Academy

2m read
·Nov 10, 2024

Hello! So we're told Colette rides her bike home from school every afternoon. She leaves school at 14:55 and arrives home at 15:25. How long does she ride her bike? So pause this video like always and see if you can answer that question: how long is her bike ride home?

All right, now to help us answer that question, I'm going to set up a timeline. So that's my timeline there, and let's say that everything is going on between 14 hours and it looks like between, actually, past 15 hours. So I'll go to 16 hours. So that is hours, and this is 15 hours, and then 16 hours would be maybe right over there 16 hours.

And this would be 14 and a half, just to make things a little bit clearer. This would be 15 and a half, just like that. Actually, it'd be a little bit— it would be something like that. And so let's see, she leaves school at 14:55. Where is that on this timeline? Well, 14:55 is 5 minutes before 15.

So it's going to be roughly right over here, so that is when Colette leaves. So that is 14:55, and then when she arrives, 15:25, that's 25 minutes after 15 hours, so that is right over there. So this right over there is when she arrives home, 15:25.

And so how long is that? Well, the way I think about it is if we go from 14:55 to 15:00, that is 5 minutes. So this part right over there is five, and then to go from 15:00 to 15:25, that's another 25 minutes.

So the total length of her trip in time is going to be 5 minutes plus 25 minutes. 5 plus 25 is 30. 30 minutes, and we are done.

Stoichiometry: mole-to-mole and percent yield | Chemistry | Khan Academy
Externalities: Calculating the Hidden Costs of Products

More Articles

View All
Tarpit Ideas: The Sequel
When some of the people ask me, “Oh, is my idea a tarpit?” I’ll be like, “Hey, well, have you talked to any users?” And they’re like, “No, I just—no, I thought you would tell me, though.” Like, it’s funny. It’s like, “How you been watching the videos?” I …
The Best Way to Move Mountain Goats? Helicopters. | National Geographic
[Music] [Applause] [Music] So the way we catch goats is we don’t tranquilize them at all. They just, what they do is they take a helicopter and they fly until they find a goat. They can have it in an area that’s relatively flat; they can catch it, and the…
Olympic Training During a Pandemic | Podcast | Overheard at National Geographic
High jump is a part of me. This is Priscilla Frederick Loomis. She’s a track and field athlete, a high jumper, and she’s training for the 2021 Olympic Games. I look at the timer; 59 seconds remain. I fix my hair and roll back my shoulders. I look at the …
Variance and standard deviation of a discrete random variable | AP Statistics | Khan Academy
In a previous video, we defined this random variable (X). It’s a discrete random variable; it can only take on a finite number of values. I defined it as the number of workouts I might do in a week. We calculated the expected value of our random variable …
Pike Surprise | Life Below Zero
This time of year, the pike are spawning in the shallows. There’s a grassy area just up around the corner where I might find some. I haven’t caught a pike yet this year, so you never know exactly what you’re going to find, but I’m hoping for some good fis…
Markets and property rights | APⓇ Microeconomics | Khan Academy
In other videos, we have touched on the idea of property rights, but in this video, we’re going to go a little bit deeper and think about how property rights connect to the notion of a market. So first of all, think about what a market means to you. You …