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t = 20 min=20*60 = 1200 s
W1 = 0,48MJ = 480000 J
P= W/t
W = P*t
W = 2500 J/s *1200 s = 3000000 J
sprawność = W1/W *100 %
sprawność = 480000 J/30000000 J *100 %
sprawność = 0,16 *100 %
sprawność = 16%