alleryA এবং B-এর 10 দিন, B এবং C-এর 15 দিন, A এবং C-এর 12 দিন সময় লাগে। তিনজনে একত্রে সময় নেবে
A9 দিন
B6 দিন
C7.5 দিন
D8 দিন
Answer & Solution
Correct answer: D. 8 দিন
সম্মিলিত হারের দ্বিগুণ হল 1/10 + 1/15 + 1/12 = 1/4, তাই তিনজনে একত্রে প্রতিদিন 1/8 অংশ কাজ করে, সুতরাং তাদের মোট 8 দিন সময় লাগবে।
Keep practising Time and Work
Browse all Time and Work questions for RRB NTPC, or explore more Quantitative Aptitude topics.
Related questions
What labor metric denotes the amount of work done by an average worker in a day?How is task time found from man-hours and worker count?If a task requires 20 man-hours, how many hours will a team of 2 workers take?A takes 12 days and B takes 24 days. A leaves 3 days before the work ends. Total time wasA does a job in 16 days, B in 8 days. A works 4 days alone, then B joins. Total time from A alone does a job in 9 days and B alone in 18 days. They earn Rs 900 together. A's share Sita does a job in 30 days. Sita and Tara together do it in 20 days. Tara alone needsA pipe alone fills a tank in 15 minutes; with a second pipe it takes 6 minutes. The second