Phil consumed 1,200 calories at lunch. He has a goal of burning at least 5% of those calories by walking on the treadmill. If walking on the treadmill burns 200 calories per hour, which statement best describes how long he should walk on the treadmill?

Five percent of 1,200 calories is 0.05 × 1,200 = 60 calories. At 200 calories per hour, burning 60 calories takes 60 ÷ 200 = 0.3 hours, or 18 minutes. To burn at least that amount, Phil should walk no fewer than 18 minutes.

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