Question

Lúcia is using energy at a rate of 420 kilocalories (kcal) per hour (h) ice skating.

At what rate is Lúcia using energy in calories per minute (cal/min)?

Answer 1

420000 calories is 60 mins so 420000/60= 7000/min I think :)

Answer 2

7,000 calories or 7 kilo cal/min.

Explanation:

Lucia is using energy at a rate of 420 kilo calories per hour ice skating.

1 kilo calories = 1000 calories

420 kilo calories = 420,000 calories

1 hour = 60 minutes

∵ Lucia is using energy per 60 minutes = 420,000 calories

∴ She is using energy per minute =
`(420,000)/(60)`

= 7,000 calories or 7 kilo calories

Lucia is using energy 7,000 calories/minute.