alleryP হলো Q-এর চেয়ে তিন গুণ কর্মক্ষম, এবং তারা একসাথে 15 দিনে শেষ করে। P-এর একার প্রয়োজন
A30 দিন
B20 দিন
C15 দিন
D45 দিন
Answer & Solution
Correct answer: B. 20 দিন
3x এবং x কাজের হার নিয়ে, 4x = 1/15 সুতরাং x = 1/60, এবং P-এর কাজের হার 3/60 = 1/20 মানে 20 দিন।
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