Question

Lucia is using energy at a rate of 420 kilocalaries per hour ice skating At what rate is lucia using energy in calories per min

Answer 1

Step-by-step explanation:

1 kcal =1000cal & 1 hour = 60 minutes

$r = \frac{420 \times 1000}{60} = 7000$

Answer 2

Lucia is using 7000 calories per minute.

Step-by-step explanation:

It is mentioned that, Lucia is using energy at a rate of 420 kilo calories per hour ice skating

We know that,

1 kilo calories = 1000 calories

Using unitary method :

420 kilo calories = 420,000 calories

Also,

1 hour = 60 minutes

In this case, Lucia is using energy per 60 minutes =  420,000 calories. So,energy used by her per minute is :

$E=\dfrac{420000 }{60}=7000\ \text{calories}$

Hence, Lucia is using 7000 calories per minute.

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Lucia is using energy at a rate of 420 kilo calories per hour ice skating At what rate is Lucia using energy in calories per min  ?

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