alleryदोन गवंड्यांना एका भिंतीसाठी अनुक्रमे 14 आणि 21 दिवस लागतात. एकत्र काम करताना त्यांना लागतील:
A8.4 दिवस
B8 दिवस
C7 दिवस
D9 दिवस
Answer & Solution
Correct answer: A. 8.4 दिवस
दररोज 1/14 + 1/21 = 5/42, म्हणून भिंतीसाठी 42/5 = 8.4 दिवस लागतात.
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