alleryA একটি কাজ 15 দিনে এবং B 10 দিনে করতে পারে। A একা 5 দিন কাজ করে, তারপর B যোগ দেয়। B, A-এর সাথে কাজ করে
A4 দিন
B6 দিন
C3 দিন
D5 দিন
Answer & Solution
Correct answer: A. 4 দিন
A একা 5/15 = 1/3 অংশ করে; বাকি 2/3 অংশ প্রতিদিন 1/6 হারে সম্পন্ন হতে 4 দিন সময় নেয়।
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