alleryরবি একা একটি পরিখা 10 দিনে খনন করতে পারে এবং সুনীল একা 15 দিনে। উভয়ে একসাথে কাজ করলে সময় লাগবে
A8 দিন
B6 দিন
C5 দিন
D7 দিন
Answer & Solution
Correct answer: B. 6 দিন
একসাথে তারা প্রতিদিন পরিখাটির 1/10 + 1/15 = 5/30 = 1/6 অংশ সম্পন্ন করে, সুতরাং 6 দিন।
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