alleryতিনজন চিত্রকর একা 12, 15 এবং 20 দিন সময় নেয়। যদি তিনজন একসাথে কাজ করে, তবে কাজটি সম্পন্ন হতে সময় লাগে
A3 দিন
B4 দিন
C5 দিন
D6 দিন
Answer & Solution
Correct answer: C. 5 দিন
দৈনিক কাজ হলো কাজের (5 + 4 + 3)/60 = 12/60 = 1/5 অংশ, তাই 5 দিন।
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