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Answer:
1.17 x 10¹¹ J
Explanation:
250 MW = 250 x 10⁶ W
7.8 min = 468 s
P = W/t
W = Pt
= 250 x 10⁶ x 468
= 117000 x 10⁶
= 1.17 x 10¹¹ J