How long would it take to lose 40lbs with just diet and exercise? (make it long)?

I''m 14 and 180lbs possibly 190 cause I haven''t checked my weight ina month, I''m dedicating my self to just diet and exercise, I''m in 8th grade and go to school and all that so its hard to have a workout schedule with that but is like a few tips on when it would be best to exercise, id prefer running but how many miles a day? And please some diet tips?

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Recommended Answer:
Here''s a little cardio workout, you can do it anywhere including at home.
40 jumping jacks
30 jumping rope (you don''t need an actual rope, just pretend)
30 high knees
30 mountain climbers
30 jumping rope
WATER BREAK
25 jumping jacks
30 uppercuts (stand in place with feet spread slightly apart, uppercut punches)
40 jumping rope
30 high knees
5 squats
BREAK and repeat

As for diet, drink at least 8 glasses of water per day and eat fruit and veggies. Read the labels and keep track of how many calories you eat per day. Shoot for around1800 since you''re young and still growing. A great website that I use to track calories and nutrients is caloriecount.about.com

Also, you can use calorie count to input your exercises and it will tell you how many calories you burn running. Then you can decide how long to run for. In addition, if you input your stats, Calorie Count will tell you your predicted date when you will reach your goal weight if you stick to the program.