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A boiling problem

Could someone help me with part B of this question? Thanks a lot!
https://isaacphysics.org/questions/bringing_to_the_boil?stage=a_level
what have you attempted so far
Reply 2
I tried to use latent heat of vaporization of water times maximum mass rate of boiling before saucepan boils over (I can’t understand the physical meaning of this part, I guess it bass on the unit) and divided by the efficiency of energy transfer, so I got the answer 1610 but its wrong and I can’t figure out why.
You have to also add the extra power you can lose from P=kt, then divide this by 0.7
(edited 2 months ago)
Reply 4
I got the right answer now. Thank you very much!

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