alleryA किसी कार्य को 15 दिनों में और B उसे 10 दिनों में कर सकता है। A अकेले 5 दिनों तक कार्य करता है, फिर B उसके साथ शामिल हो जाता है। B, A के साथ कितने दिनों तक कार्य करता है?
A4 दिन
B6 दिन
C3 दिन
D5 दिन
Answer & Solution
Correct answer: A. 4 दिन
A अकेले 5/15 = 1/3 कार्य करता है; शेष 2/3 कार्य को 1/6 प्रतिदिन की दर से पूरा करने में 4 दिन लगते हैं।
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