2 month plan help me please?

I'm 17, 5'9 250 pounds ( Yes I know FAT! ) I'm working out 3 days a week from 1:30 pm to 4:00 pm I will be running on my tread mil,jump roping,Lifting weights and stay on a healthy diet! Veggies chicken fish nothing but water for 2 months is it possible for me to lose 50 to 60 pounds maybe even more? On the other days I don't workout I'll still walk at night for 20 to 30 min and get plenty of sleep!