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.

Constant-pressure calorimetry | Thermodynamics | AP Chemistry | Khan Academy

Stoic Lessons People Learn Too Late in Life | You'll Not Regret Watching This Video

View All

Worked example: Parametric arc length | AP Calculus BC | Khan Academy

Let’s say that X is a function of the parameter T, and it’s equal to cosine of T, and Y is also defined as a function of T, and it’s equal to sine of T. We want to find the arc length of the curve traced out, so the length of the curve from T equals 0 to …

first day of changing my life

From my childhood, I always been a very success-oriented person. When I was in high school, due to some financial and family issues, I was very depressed, and I started to not take care of my mental health and school life. But one day, when I was randomly…

Introduction to factoring higher degree monomials | Algebra 2 | Khan Academy

In this video, we’re going to dig a little bit deeper into our knowledge or our understanding of factoring. Now, factoring is something that we’ve been doing for many years now. You can go all the way back to when you’re thinking about how would I factor …

Beautiful “Underwater Kaleidoscope” | National Geographic

I was inspired to be an ocean explorer from a very young age. We had a swimming pool in my backyard, and I would put on a little mask and fins and pretend I was Jacques Cousteau or I was swimming with sharks or dolphins or something. I had somewhat of an …

Covalent bonds | Molecular and ionic compound structure and properties | AP Chemistry | Khan Academy

In a previous video, we introduced ourselves to the idea of bonds and the idea of ionic bonds, where one atom essentially is able to take electrons from another atom. But then, because one becomes positively charged and the other becomes negatively charge…

Monarch Butterflies Get Tiny Radio Trackers | Expedition Raw

[Music] He’s like a little kid. It’s wonderful. We’re trying to put the first electronic tag on a free flying migrating monarch butterfly. If that works, then we could for the first time really follow them in the wild, how they migrate, and find out exact…

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

More Articles