CAHSEE Math 1.2 Measurement and Geometry

CAHSEE Math Measurement and Geometry: Drill Set 1, Problem 2. Convert the value to meters per second.

AlgebraWord Problems
CAHSEE MathMeasurement and Geometry
Coordinates and GraphsAppropriate Units and Scales
LanguageEnglish Language
Mathematics and Statistics AssessmentModeling and Applications
Measurement and GeometryRates and units

Transcript

00:23

We have 72 KILOMETERS per HOUR which we want

00:27

to convert to METERS per SECOND.

00:30

Let's start by getting half way there and make it meters per hour.

00:34

Okay, so "KILO" means a thousand.

00:38

So 72 kilometers per hour is 72 thousand meters per hour.

00:43

Now to get hours converted into seconds.

00:46

Well, an hour has 60 minutes, which has 60 seconds...

00:49

so 60 times 60 gets you 3,600 seconds in an hour.

00:54

Go ahead and count 'em if you want to double-check. It's your hour.

00:58

The new equation then should be 72,000 over 3,600, and that's meters per second.

01:05

All we have to do now is reduce the number and we're there.

01:08

Cross out the 2 zeros here and here... and we have 720 over 36.

01:13

36 goes into 72 twice... and we have 20...

01:17

and our answer is B -- 20 meters per second.