alleryरवि अकेले एक खाई को 10 दिनों में खोद सकता है और सुनील अकेले 15 दिनों में। दोनों को एक साथ मिलकर कितने दिन लगेंगे?
A8 दिन
B6 दिन
C5 दिन
D7 दिन
Answer & Solution
Correct answer: B. 6 दिन
दोनों मिलकर प्रतिदिन खाई का 1/10 + 1/15 = 5/30 = 1/6 भाग खोदते हैं, अतः 6 दिन लगेंगे।
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