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Susan has 96 minutes to
complete a test at school.

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The test begins at 1:59 PM.

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And Susan has volleyball
practice at 4:00 PM.

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How much time will Susan have
between the end of the test

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and the beginning of
volleyball practice?

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Let's think about
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
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
little time line here.

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

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

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Then we're going to have 4
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
and then go on from 4:00 PM.

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And then the test
begins at 1:59.

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So let me continue
the number line.

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So this right over
here is 1:00 PM.

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

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We know that there are
60 minutes in an hour.

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So 1:59 is 1 minute
before 2:00 PM.

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So I'm not drawing it
completely it scale,

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but this right over
here is 1:59 PM.

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

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

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

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

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So this is 1 minute.

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So this is how long the
test has been going on

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since the beginning.

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

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

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

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So we know that the
entire test is 96 minutes.

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So we're going to get
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
out is, is what is left over?

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What is this distance
right over here?

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Or what is this
time, this difference

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in time right over here?

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And so to figure
that out, we had

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to figure out the time at
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
minutes have passed.

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And so if we, if we say
well how many more minutes

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have to go on for
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
elapses past 3 minutes

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is 96 minus 61,
which is 35 minutes.

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

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And so now our question
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
minutes in an hour.

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4:00 PM is essentially
the 60th minute.

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

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

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before she has to get
to volleyball practice.

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Just as a review.

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

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That gets us to
61 total minutes.

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Then another 35 minutes gets
us to 96 minutes have passed.

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And that also gets
us to 3:35, which

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means we have 25
minutes until 4:00.

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