alleryA আৰু B-য়ে একেলগে এটা কাম 12 দিনত শেষ কৰে। A-ৰ অকলে 20 দিন সময় লাগে। B-ৰ অকলে সময় লাগিব:
A24 দিন
B28 দিন
C30 দিন
D32 দিন
Answer & Solution
Correct answer: C. 30 দিন
1. তেওঁলোকে একেলগে প্ৰতিদিনে কামটোৰ এক-দ্বাদশ অংশ সম্পূৰ্ণ কৰে।
2. A-য়ে অকলে প্ৰতিদিনে এক-বিংশ অংশ সম্পূৰ্ণ কৰে।
3. গতিকে B-ৰ দৈনিক ভাগ হ'ল 1/12 - 1/20।
4. সাধাৰণ হৰ হিচাপে 60 ল'লে, সেয়া হ'ল 5/60 - 3/60 = 2/60, যিটো হ'ল এক-ত্ৰিংশ অংশ।
5. গতিকে B-ক অকলে 30 days লাগিব, যিটো যুক্তিগতভাৱেই A-তকৈ লেহেমীয়া।
_Source: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.3 Inverse Proportion_
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