Can you tell me what number of miles should i run to lose 5 pounds a week?

About 175 miles !: Why not select a more moderate goal. Try setting goal for 1 up to max of 2 lbs per week average. Insure that calories burned > calories consumed. Drink at least 8 - 8 oz glasses of water /day. Aim for 8 hrs of sleep & at least 5 servings of vegetables & 4 of fruit /day. Use whole grain when possible. Avoid soda, alcohol & junk carbs. Get mix of cardio & weight lifting exercises.