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SAT Math Videos 353 videos
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SAT Math: Using Time and Distance to Calculate Speed 14 Views
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Description:
Liz leaves her home to drive on a straight highway that leads directly across town for a job interview. At 8:00 a.m., she has driven 5 miles from her house. At 9:15 a.m., she is 30 miles from her house. What is her average speed in miles per hour?
Transcript
- 00:03
Okay shmoop er's follow on for the previous math question
- 00:06
That was number four here Question is if this keeps
- 00:09
writing her current average feeling seeing road how far away
- 00:11
would he be from her house at noon Ok so
- 00:13
this camps on tio fourth one here which is well
Full Transcript
- 00:17
just go home and wait for Job infinity and 5
- 00:20
miles per hour at nine Fifteen she's thirty miles around
- 00:22
their speed in miles an hour when we figured out
- 00:23
that was twenty So to get the answer for five
- 00:27
here what do we do Well if liz has been
- 00:29
driving since eight a m and she's been driving for
- 00:33
four hours already also at eight a M she was
- 00:36
five miles from her house So you just add that
- 00:39
number to the very end Right So we figured out
- 00:42
earlier question she was going twenty miles an hour You
- 00:45
want four hours That's eighty miles She was started out
- 00:47
at five miles away So we got eighty plus five
- 00:50
and that gets her eighty five miles from her house
- 00:52
And wow she really can go the distance And the
- 00:54
key thing here on these questions is if you miss
- 00:57
The first one If you missed number four you're also
- 01:00
going to miss number five So you gotta pay super
- 01:03
careful attention to with all this stuff So good luck 00:01:05.863 --> [endTime] out there
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