Jose can jog 1 1/3 miles in 1/4 hour. find his average speed in miles per hour

So even though it'll be a little strange, you do just take the miles and divide by the hours.  Since 1 1/3 is the same as 4/3 then the rate = (4/3)/(1/4).  

That's the same as 4/3 * 4 = 16/3 miles per hour.  Or 5 1/3 miles per hour.