50
5
5/4
1/5
Correct answer is B
Heat energy = Electrical energy mc\(\theta\) = power x time 0.6 x c x (100 - 25) = 500 x t1 and, 0.2 x c x (100 - 10)= 100 x t2 \(\frac {t_1}{t_2}\) = 5
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