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