Water 71

Water was heated to 80°c then allowed to cool at a rate of 6°c per minute. After how long was the temperature 8°C?

Correct answer:

t =  12 min

Step-by-step explanation:

t1=80 °C t2=8 °C  r=6 °C/min  Δt=t1t2=808=72 °C  t=rΔt=672=12 min

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