How many calories do I lose doing this type of sport?

Unknown

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For the last 2 weeks, I have been rollerblading everyday at night for 2 hours straight! and 30 minutes of jogging/running. I think it's a good time of the day because at night its useful cool and refreshing! I was wondering, how many calories do I burn by 2 hours of rollerblading and 30 minutes of jogging/running?
And I weigh 171 and my height is 5'5, so I am like chubby, but i dont wanna be chubby anymore because i want impress this girl i like and/or girls by being kinda skinny by the end of the year! so do you think it's impossible for me to lose like 30-40 pounds by the end of year just doing this exercise everyday?
 
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