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?