How much exercise will burn off junk food?

DONUT
Dunkin Donuts Chocolate Frosted Donut (230 calories)
59 minutes of walking (3 mph).

BREAKFAST SANDWICH
McDonald's Egg McMuffin (300 calories)
32 minutes of running (5 mph).

Full text => http://food.yahoo.com/blog/yahoofreshpicks/9960/what-chain-food-favorites-cost-in-exercise/