Average speed of a bike?

on the road, you can expect to be able to leisurely do 20 kilometres an hour. You can easily ramp that up to twenty five kph or above, but keep in mind that strong wind will definitely help or hinder your performance depending on the direction.
 
I am wondering about the average speed of a standard 15 speed bike on normal flat roads. Over the course of 5 miles, what speed could i expect to account for in this trek/how long would it take me? If you give me one, I can find the other but most importantly i need to know the average speed. I am somewhat athletic and can push myself to run a mile in 8-9 minutes so what do I have to expect?
 
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