alleryসীতা একটি কাজ 30 দিনে করে। সীতা এবং তারা একত্রে এটি 20 দিনে করে। তারার একা প্রয়োজন
A40 দিন
B45 দিন
C50 দিন
D60 দিন
Answer & Solution
Correct answer: D. 60 দিন
তারার কাজের হার হল 1/20 - 1/30 = 1/60, সুতরাং তার প্রয়োজন 60 দিন।
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