Given, base area of cooking pot, A=0.2m2 Thickness, l=2cm=2×10−2m Boiling rate, R=
m
t
=3kg/min=
1
20
kg∕s Thermal conductivity, K=120Js−1m−1K−1 Heat of evaporation, L=2×106J/kg The amount of heat flowing into water through the base of cooking pot, Q=
KA(T1−T2)t
l
where, T1= Temperature of the cooking p and T2= Boiling point of water. Heat required to boil water, Q′=mL According to given situation, Q=Q′