Quick answer: 5/6th of a mile if he keeps the same pace.
Long answer: so first we divide both fractions by 2 so that we get a more simple fraction for 2/5, which is now 1/5, and 1/3 becomes 1/6. Now since we want a full mile we multiply both the fractions by 5 so that the fraction representing time equates to 1. And 5•1/6 is 5/6.
