medium · SAT Math
A fitness app tracks two types of exercises: walking (w) and running (r). A user wants to burn at least 400 calories. Walking burns 4 calories per minute and running burns 10 calories per minute. The user also wants the total exercise time to be no more than 60 minutes.
Which inequality represents the calorie goal?
- 4w + 10r ≥ 400
- 4w + 10r ≤ 400
- 10w + 4r ≥ 400
- w + r ≤ 60
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