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• - [Instructor] We are asked, "How much time has passed

• "from the time on the left," so right over here,

• "to the time on the right?"

• Which we see right over here.

• And they say that, "The time passed is less than 12 hours."

• So like always, pause this video

• before we work on this together.

• All right.

• So first I just wanna figure out

• what time is being told by each of these clock faces.

• So let's go here on the left.

• So the first thing I'm gonna do is look at the hour hand.

• And we can see that the hour hand

• has gone a little bit past six.

• So it's going to be six-something.

• Six-something.

• And then to figure out what the minutes are

• I can look at the minute hand right over here.

• And say, "Well, how far has it gone in minutes?"

• And I like to count by fives

• because we know when we go from 12 on the clock to one

• that actually one, two, three,

• four, five minutes have gone by.

• And in fact, between any two numbers, it's five minutes.

• So we go five, 10, 15, 20,

• 25, 30, 35, 40.

• And then 41, 42, 43.

• That's where it's pointing.

• So it's 6:43, is where we're starting.

• And then where we're ending, let's see.

• The hour hand is a little bit past nine.

• You can see it's past nine.

• And so it's not necessarily

• what it's closest to, it's what it's past.

• So even if the hour hand was like there,

• even if it was closer to 10 but not quite at 10,

• you would say, "Okay, it's gonna be nine-something."

• It's passed nine.

• And only if it got to 10 or past 10,

• then you would say, "It's 10-something."

• So this is gonna be nine-something.

• And to figure out what that something is,

• once again, we start here, we can count by fives.

• Five minutes, 10 minutes, and then we have one more.

• We get to 11 minutes.

• So it's 9:11.

• And they tell us that this is less than 12 hours apart.

• So it's not like 6:43 in one day, maybe at night,

• and then 9:11 the next morning.

• This is maybe the same morning or the same evening.

• And so we can set up a timeline here.

• So let's set up a timeline.

• And so, let's see.

• The sixth hour is going to be important,

• so that's six o'clock.

• And let's see, maybe we wanna go all the way to 10 o'clock.

• So that we go beyond 9:11.

• And so then we could say, let's go,

• have to do seven, eight, and nine.

• I just wanna get my spacing right.

• So let's say that this is seven o'clock right over here.

• This is eight o'clock right over there.

• And then that is nine o'clock right over there.

• It's not gonna be a perfect drawing,

• but this is pretty close.

• And so let's see.

• We are starting at 6:43.

• Which is going to be, let's see, it's going to be roughly,

• and I just have to say roughly,

• it's going to be right over there.

• That's where we are starting.

• And then 9:11 is going to be roughly right over there.

• So that is when we are ending.

• So how much time has gone by?

• Well, to go from 6:43 to seven o'clock,

• how many minutes is that?

• Well, to go from 43 minutes to 60 minutes,

• you have to add 17 minutes.

• So this right over here, that is 17 minutes.

• Just write it out.

• And then we can see, we have another two hours

• that goes by from seven o'clock to nine o'clock.

• So then that's two hours.

• And then to go from nine o'clock to 9:11, what is going on?

• Well, that's going to be another 11 minutes.

• 11 minutes.

• So how much time has happened?

• It's going to be 17 minutes plus two hours plus 11 minutes.

• Well, I find it a little bit easier

• just to think about the minutes first.

• So if I add 17 minutes to 11 minutes, 17 plus 11 is 28.

• I can do that on the side if you want to see it.

• Seven plus one is eight.

• One plus one is two.

• So we are going to have a total of two hours and 28 minutes.

• And I could write it that way.

• Two hours, two hours and 28 minutes.

• And we are done.

- [Instructor] We are asked, "How much time has passed

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A1 clock hour roughly passed timeline figure

# Time past between two clock faces

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林宜悉 posted on 2020/04/06
Video vocabulary