A तथा B मिलकर किसी कार्य को 72 दिन में B तथा C मिलकर 120 दिन में तथा A तथा C मिलकर 90 दिन में पूरा कर सकते हैं | A, B, तथा C मिलकर उसको पूरा करने में कितना समय लेगें ?

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