Originally Posted by
ladyk My question is this. I want to understand how I would have gotten 88/60. Did I divide something? And did that something have to do with 1 mile equaling 5280 feet, and 3600 in one hour?
$\displaystyle 1$ mile equals $\displaystyle 5280$ feet
$\displaystyle 1$ hour equals $\displaystyle 3600$ seconds
So when we have $\displaystyle 1$ mile per hour, This is the same as:
$\displaystyle 5280$ feet per $\displaystyle 3600$ seconds
But as we want ft/sec, so for $\displaystyle 1$ second, we divide the value by 3600 so we get:
$\displaystyle \frac{5280}{3600}$ ft/sec which simplifies to $\displaystyle \frac{88}{60}$ ft/sec
So, by this:
$\displaystyle 1$ mph = $\displaystyle \frac{88}{60}$ ft/sec