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물살을 거스르는 보트 속도: v_b - v_c = 8 km/h, 물살을 따라: v_b + v_c = 12 . 구하라
물살을 거스르는 보트 속도: v_b - v_c = 8 km/h, 물살을 따라: v_b + v_c = 12 . 구하라
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