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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

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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