Joe drove 538 miles in 9 hours 15 minutes what was his average speed per hour

To calculate any speed, the equation is speed=distance/time

Basically, you first need to take your 9 hours and 15 minutes and combine them into a number with a decimal value.

So, 15*4=60

Sound familiar? Good, because 25*4=100, so they are the same here.

So, we can say 9 hours and 15 minutes is equal to 9.25

Take this now: Speed=538/9.25

You get 58.1621, which you can round to 58.2

This is, of course, your final answer, so Joe drove at 58.16 mph