Question

For every fifteen minutes of exercise, you burn off 70 calories. How long would it take to burn off 250 calories?

Answer 1

15 minutes of exercise, you burn off 70 
? ----------------------------------burn off 250 calories

250 x 15 / 70 = 53.57

answer
53.57 minutes to burn off 250 calories

Answer 2

3.57142857143 hours my dude