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You don't have to run the entire distance at the same speed, but adapt your speeds so your average increases. You can get an average pace of eight minutes a mile, for instance, by running the first mile in 7 1/2 minutes, the second one in 8 1/2 and the last one in eight minutes.
Add about two minutes to your usual pace. For example, if you usually run three miles in 30 minutes (10 minutes per mile), expect to run four miles in 48 minutes (12 minutes per mile) or longer. Build gradually.