Heating Water at 90C: Why It Takes Longer Than Lower Temps

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Why heating water at 90C takes longer than heating water at lower temperatures such as 70C?
 
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I never heard of this before. But I can't give you an answer since I don't know much about heat transfer.
 
Because a lower initial temperature requires more energy to reach a set point? Water heats linearly (generally) between 0C and 100C (STP) ... 4186j/C or so.
 
You need to show your work. We cannot give you answers.

Why do you think it takes longer?
 
does the specific heat capacity has something to do with this?