Question by Lê Quốc Trần Anh - Discuss with MathYouLike

Lê Quốc Trần Anh Coordinator

05/01/2018 at 17:30

Running at 12 miles per hour burns about 1200 calories per hour. Running at 5 miles per hour burns about 450 calories in an hour. How many minutes longer does one have to run to burn 300 calories at 5 miles per hour than at 12 miles per hour?

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Phan Thanh Tinh Coordinator 10/01/2018 at 10:57

1 h = 60 m

It takes : \(60.\dfrac{300}{1200}=15\) (m) to burn 300 cal when running at 12 m/h

It takes : \(60.\dfrac{300}{450}=40\) (m) to burn 300 cal when running at 5 m/h

The answer is : 40 - 15 = 25 (m)

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