alleryএকজন দর্জি 20 দিনে একটি ব্যাচ সেলাই করেন, তাঁর সঙ্গী 30 দিনে করেন। একসাথে তাঁরা এটি শেষ করেন
A25 দিন
B12 দিন
C10 দিন
D15 দিন
Answer & Solution
Correct answer: B. 12 দিন
তাঁদের সম্মিলিত কাজের হার প্রতিদিন 1/20 + 1/30 = 5/60 = 1/12 অংশ, যার ফলে 12 দিন লাগবে।
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