WEBVTT 00:00:00.830 --> 00:00:05.060 Susan has 96 minutes to complete a test at school. 00:00:05.060 --> 00:00:09.340 The test begins at 1:59 PM. 00:00:09.340 --> 00:00:13.940 And Susan has volleyball practice at 4:00 PM. 00:00:13.940 --> 00:00:16.740 How much time will Susan have between the end of the test 00:00:16.740 --> 00:00:18.750 and the beginning of volleyball practice? 00:00:18.750 --> 00:00:20.640 Let's think about this a little bit. 00:00:20.640 --> 00:00:22.410 So the test begins at 1:59. 00:00:22.410 --> 00:00:25.124 So it's a very strange time to begin a test, 00:00:25.124 --> 00:00:26.290 but let's just go with that. 00:00:26.290 --> 00:00:28.630 So let me draw a little time line here. 00:00:28.630 --> 00:00:35.030 So let's say that this is 2 o'clock PM. 00:00:35.030 --> 00:00:37.650 Then we're going to have 3:00 PM. 00:00:42.060 --> 00:00:47.990 Then we're going to have 4 o'clock PM, which is also 00:00:47.990 --> 00:00:49.960 when volleyball practice begins. 00:00:49.960 --> 00:00:51.440 So this is volleyball practice. 00:00:51.440 --> 00:00:54.760 It's going to start then and then go on from 4:00 PM. 00:00:54.760 --> 00:00:57.000 And then the test begins at 1:59. 00:00:57.000 --> 00:00:58.850 So let me continue the number line. 00:00:58.850 --> 00:01:02.530 So this right over here is 1:00 PM. 00:01:05.880 --> 00:01:10.900 So the test is going to begin at 1:59, so 1 minute before 2 PM. 00:01:10.900 --> 00:01:12.950 We know that there are 60 minutes in an hour. 00:01:12.950 --> 00:01:16.460 So 1:59 is 1 minute before 2:00 PM. 00:01:16.460 --> 00:01:18.210 So I'm not drawing it completely it scale, 00:01:18.210 --> 00:01:24.640 but this right over here is 1:59 PM. 00:01:24.640 --> 00:01:29.220 So we use 1 minute to get to 2:00 PM. 00:01:29.220 --> 00:01:32.440 And then, let's see, we have to get up to 96 minutes. 00:01:32.440 --> 00:01:36.430 So then you get another 60 minutes to go to 3:00 PM. 00:01:36.430 --> 00:01:39.580 So, so far, we've used a cumulative 61. 00:01:39.580 --> 00:01:40.654 So this is 1 minute. 00:01:40.654 --> 00:01:42.570 So this is how long the test has been going on 00:01:42.570 --> 00:01:43.403 since the beginning. 00:01:43.403 --> 00:01:48.360 So 1 minute by 2:00 PM, 61 minutes by 3:00 PM. 00:01:48.360 --> 00:01:52.225 If we go all the way to 4:00 PM, that's going to be another 60. 00:01:52.225 --> 00:01:56.110 That'd be 121 minutes, which is longer than the actual test. 00:01:56.110 --> 00:01:58.952 So we know that the entire test is 96 minutes. 00:01:58.952 --> 00:02:00.660 So we're going to get to some point right 00:02:00.660 --> 00:02:03.140 over here, some point like this. 00:02:03.140 --> 00:02:06.030 That's 96 minutes. 00:02:06.030 --> 00:02:09.590 And what we need to figure out is, is what is left over? 00:02:09.590 --> 00:02:12.355 What is this distance right over here? 00:02:12.355 --> 00:02:14.490 Or what is this time, this difference 00:02:14.490 --> 00:02:15.690 in time right over here? 00:02:15.690 --> 00:02:17.176 And so to figure that out, we had 00:02:17.176 --> 00:02:19.950 to figure out the time at which 96 minutes have passed 00:02:19.950 --> 00:02:21.950 since the beginning of the exam. 00:02:21.950 --> 00:02:25.090 So at 3 o'clock, 61 minutes have passed. 00:02:25.090 --> 00:02:27.500 And so if we, if we say well how many more minutes 00:02:27.500 --> 00:02:29.430 have to go on for the end of the test? 00:02:29.430 --> 00:02:32.420 It's going to be 96 minus 61. 00:02:32.420 --> 00:02:36.600 So the amount of time that elapses past 3 minutes 00:02:36.600 --> 00:02:40.930 is 96 minus 61, which is 35 minutes. 00:02:40.930 --> 00:02:48.717 So this right over here is going to be 3:35. 00:02:48.717 --> 00:02:50.800 And so now our question is, how much time is there 00:02:50.800 --> 00:02:55.800 between 3:35 and 4:00 PM? 00:02:55.800 --> 00:02:58.950 Well, once again, 60 minutes in an hour. 00:02:58.950 --> 00:03:02.020 4:00 PM is essentially the 60th minute. 00:03:02.020 --> 00:03:09.360 So if we take 60 minus 35, we get 2:25. 00:03:09.360 --> 00:03:15.300 So she has a total of 25 minutes remaining after the test 00:03:15.300 --> 00:03:17.580 before she has to get to volleyball practice. 00:03:17.580 --> 00:03:18.560 Just as a review. 00:03:18.560 --> 00:03:21.660 One minute between 1:59 and 2:00, then another 60. 00:03:21.660 --> 00:03:23.870 That gets us to 61 total minutes. 00:03:23.870 --> 00:03:30.160 Then another 35 minutes gets us to 96 minutes have passed. 00:03:30.160 --> 00:03:32.810 And that also gets us to 3:35, which 00:03:32.810 --> 00:03:37.255 means we have 25 minutes until 4:00.