Mathematics · Time and Work
A और B मिलकर एक कार्य को 20 दिनों में पूरा कर सकते हैं। B अकेला उसी कार्य को 30 दिनों में पूरा कर सकता है। A अकेला उस कार्य को कितने दिनों में पूरा कर सकता है?
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