allerySita-ই এটা কাম 30 days-ত কৰে। Sita আৰু Tara-ই একেলগে ইয়াক 20 days-ত কৰে। Tara-ক অকলে প্ৰয়োজন
A40 days
B45 days
C50 days
D60 days
Answer & Solution
Correct answer: D. 60 days
Tara-ৰ হাৰ হ'ল 1/20 - 1/30 = 1/60, গতিকে তেওঁক 60 days প্ৰয়োজন।
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