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CAHSEE Math 1.1 Measurement and Geometry 203 Views


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CAHSEE Math Measurement and Geometry: Drill Set 1, Problem 1. What was Jenny's approximate average speed in feet per second?

Language:
English Language

Transcript

00:03

Here's a shmoopy question, comin' at ya...

00:05

Jenny, world record holder in the Segway 500, is pumped and ready to defend her title.

00:11

During the race, her average speed is 13 mph.

00:15

Now that's some good TV.

00:18

What was Jenny's approximate average speed in feet per second?

00:22

And here are the potential answers...

00:28

So this question is of a rate-distance-time flavor, which presumes that we know that there

00:34

are about 5,300 feet in a mile.

00:36

It's also testing us on units conversion, because the ANSWER is in feet per second -- not

00:41

miles per hour. The problem itself is pretty straightforward

00:45

though, once we get the units right.

00:47

If Jenny is going 13 MILES per hour, she is going 13 times 5,300 feet per hour...

00:53

or 69,000 FEET per hour.

00:56

But the questions asks not per HOUR but per second -- so we have to convert hours to minutes.

01:01

...60 of those minute things in an hour...

01:04

...and since there are 60 seconds in a minute...

01:06

...we multiply 60 by 60 and get 3,600.

01:10

So now divide the 69,000 by 3,600 and we get 19.1...

01:15

...which is her rate in feet per second or answer... D.

01:19

That's some speedy segwayin', Jenny.

01:21

What a thrillseeker.

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