A' B' এর চেয়ে দ্বিগুণ কাজ করতে পারে; তারা দু’জন একত্রে একটি কাজ ১৪ দিনে শেষ করতে পারে। 'A' একা কাজটি কতদিনে করতে পারবে?
A. ১২ দিনে
B. ২৪ দিনে
C. ২১ দিনে
D. ১৫ দিনে
সঠিক উত্তরঃ
C.
২১ দিনে
Explanation:
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