Question

42 inches per second to miles per hour
Show work

Answer 1

2.38
`(mi)/(hr)`

Explanation:

1. Change seconds to hours:

`(42in)/(1sec) x (3600sec)/(1hr)` = 151200
`(in)/(hr)`(seconds cancel out)

*because there are 3600 seconds in one hr, multiplying by 3600sec/1hr is basically multiplying by 1.

2. Change inches to miles:

151200
`(in)/(hr)` x
`(1ft)/(12in)` x
`(1mi)/(5280ft)` = 2.38
`(mi)/(hr)`

Make sure your units cancel out so you are left only with the units you want