I'm at a really loose end - I just can't seem to grab some fundamentals of Speed Distance Time.

Can someone explain to me how they discover the answer to the following equipped with steps on how to figure out. I really cannot remember the process in how to do so since I left school.

> 
> If your journey lasts 11 hours and 15 minutes what speed are you
>  travelling at if you cover 90 miles?
> 
> 
> 

I know the answer is 8MPH but I'm not sure in how to reach the answer.

Thanks

K