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cari dulu waktu yg dibutuhkan ketiga kran dibuka bersama sama
1/t = 1/20 + 1/24 + 1/30 = (6 + 5+ 4) / 120 = 15 / 120 = 1/8
t = 8 menit utk 1 bagian
t = 6 menit utk 6/8 x 1 bagian = 3/4 bagian jawaban A