Question

Lúcia is using energy at a rate of 420420420 kilocalories (\text{kcal})(kcal)left parenthesis, k, c, a, l, right parenthesis per hour (\text{h})(h)left parenthesis, h, right parenthesis ice skating.
At what rate is Lúcia using energy in calories per minute \left(\dfrac{\text{cal}}{\text{min}}\right)(
min
cal
​ )left parenthesis, start fraction, c, a, l, divided by, m, i, n, end fraction, right parenthesis?

Answer 1

Lúcia is using energy at a rate of 420 kcal/h.

To find out the rate per minute we need to transform number:
420 kcal/h = 420 000 cal/h
1h = 60 min
420 000 cal/h = 420 000 cal /(60min) = 7 000 cal / min or 7kcal/min

Answer 2

Answer:

Lucia is using energy at a rate of 7 kilocalories per minute.

Step-by-step explanation:

In order to solve this problem, we just need to transform from kilocalories per hour to kilocalories per minutes.

We know that, Lucia is using energy at a rate of 420 kcal/hr. So, if 1 hour equals 60 minutes, we just need to use this to find the answer

$x=420\frac{kcal}{hr} \times \frac{1hr}{60min} = 7\frac{kcal}{min}$

Therefore, Lucia is using energy at a rate of 7 kilocalories per minute.