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P = 2kW = 2000W
t = 1min = 60s
W = Pt
W = 60s * 2 000W = 120 000J = 120kJ
b)
P = 5kW = 5000W
W = 1MJ = 1 000 000J
t = W/P
t = 1 000 000J/5000W = 200s