Question

Peyton is a sprinter who can run the 40 yard dash in 4.5 seconds. He converts his speed into miles per hour, as shown below:

Which conversion factor is written incorrectly to convert his speed to miles per hour?
40 yd/4.5 sec
3ft/1yd
5280ft/1 mile
60sec/1min
60min/1 hour

Answer 1

It’s 40yd because if you multiply 10 times 4 equals 40 and it’s 4.5 half

Answer 2

`(5280 ft)/(1 mi)`

Explanation:

The ratio
`(5280 ft)/(1mi)` is incorrectly written because it is missing missing the ft unit. For a conversion equation to be right, each units should be able to cancel each other out. The factor should be
`(1 min)/(5280 ft)` .

The correct conversion is:

`(40 yd)/( 4.5 sec) * (3 ft)/(1 yd) * (1 mi)/(5280 ft)* (60 sec)/(1 min) * (60 min)/(1 hr)`