alleryKiran হলো Lata-র চেয়ে তিন গুণ কর্মক্ষম, যার একা 60 দিন প্রয়োজন। একসাথে তাদের প্রয়োজন
A18 দিন
B12 দিন
C15 দিন
D20 দিন
Answer & Solution
Correct answer: C. 15 দিন
Lata প্রতিদিন 1/60 এবং Kiran প্রতিদিন 3/60 অংশ করে, মোট 4/60 = 1/15, তাই 15 দিন।
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