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Susan has 96 minutes to[br]complete a test at school.

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The test begins at 1:59 PM.

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And Susan has volleyball[br]practice at 4:00 PM.

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How much time will Susan have[br]between the end of the test

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and the beginning of[br]volleyball practice?

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Let's think about[br]this a little bit.

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So the test begins at 1:59.

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So it's a very strange[br]time to begin a test,

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but let's just go with that.

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So let me draw a[br]little time line here.

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So let's say that[br]this is 2 o'clock PM.

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Then we're going[br]to have 3:00 PM.

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Then we're going to have 4[br]o'clock PM, which is also

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when volleyball practice begins.

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So this is volleyball practice.

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It's going to start then[br]and then go on from 4:00 PM.

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And then the test[br]begins at 1:59.

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So let me continue[br]the number line.

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So this right over[br]here is 1:00 PM.

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So the test is going to begin at[br]1:59, so 1 minute before 2 PM.

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We know that there are[br]60 minutes in an hour.

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So 1:59 is 1 minute[br]before 2:00 PM.

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So I'm not drawing it[br]completely it scale,

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but this right over[br]here is 1:59 PM.

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So we use 1 minute[br]to get to 2:00 PM.

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And then, let's see, we have[br]to get up to 96 minutes.

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So then you get another 60[br]minutes to go to 3:00 PM.

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So, so far, we've[br]used a cumulative 61.

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So this is 1 minute.

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So this is how long the[br]test has been going on

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since the beginning.

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So 1 minute by 2:00 PM,[br]61 minutes by 3:00 PM.

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If we go all the way to 4:00 PM,[br]that's going to be another 60.

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That'd be 121 minutes, which[br]is longer than the actual test.

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So we know that the[br]entire test is 96 minutes.

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So we're going to get[br]to some point right

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over here, some point like this.

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That's 96 minutes.

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And what we need to figure[br]out is, is what is left over?

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What is this distance[br]right over here?

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Or what is this[br]time, this difference

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in time right over here?

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And so to figure[br]that out, we had

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to figure out the time at[br]which 96 minutes have passed

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since the beginning of the exam.

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So at 3 o'clock, 61[br]minutes have passed.

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And so if we, if we say[br]well how many more minutes

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have to go on for[br]the end of the test?

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It's going to be 96 minus 61.

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So the amount of time that[br]elapses past 3 minutes

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is 96 minus 61,[br]which is 35 minutes.

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So this right over here[br]is going to be 3:35.

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And so now our question[br]is, how much time is there

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between 3:35 and 4:00 PM?

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Well, once again, 60[br]minutes in an hour.

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4:00 PM is essentially[br]the 60th minute.

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So if we take 60[br]minus 35, we get 2:25.

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So she has a total of 25[br]minutes remaining after the test

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before she has to get[br]to volleyball practice.

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Just as a review.

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One minute between 1:59[br]and 2:00, then another 60.

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That gets us to[br]61 total minutes.

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Then another 35 minutes gets[br]us to 96 minutes have passed.

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And that also gets[br]us to 3:35, which

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means we have 25[br]minutes until 4:00.

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