AP Police SI previous year question
A finishes a task alone in 25 days (12 hrs/day); B in 50 days (12 hrs/day). B starts, A joins after 2 days. B works 18 hrs/day, A works 12 hrs/day. Ratio of work done by A and B after 7 days from start is
Asked in AP Police SI Prelims: 2023 (Paper I & II) · Quantitative Aptitude
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Correct answer: (B) 20:21
Total work = 300 man-hours (A's rate) / 600 man-hours (B's rate). B works 18 hrs/day for all 7 days = 126 hrs → 126/600 = 0.21. A works 12 hrs/day for 5 days (joins day 3) = 60 hrs → 60/300 = 0.2. Ratio A:B = 20:21.
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हिंदी में प्रश्न
A अकेला एक कार्य 25 दिनों में (प्रतिदिन 12 घंटे) पूरा करता है; B उसी कार्य को 50 दिनों में (प्रतिदिन 12 घंटे) पूरा करता है। B कार्य शुरू करता है और A 2 दिन बाद उसमें शामिल होता है। B प्रतिदिन 18 घंटे और A प्रतिदिन 12 घंटे कार्य करता है। शुरुआत से 7 दिनों बाद A और B द्वारा किए गए कार्य का अनुपात है
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सही उत्तर: (B) 20:21
कुल कार्य = 300 मानव-घंटे (A की दर) / 600 मानव-घंटे (B की दर)। B सभी 7 दिनों तक प्रतिदिन 18 घंटे काम करता है = 126 घंटे → 126/600 = 0.21। A (दिन 3 से जुड़कर) 5 दिनों तक प्रतिदिन 12 घंटे काम करता है = 60 घंटे → 60/300 = 0.2। अनुपात A:B = 20:21।
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