RRB NTPC CBT-1 previous year question
A and B can do a piece of work in 12 days and 12 days, respectively. Both work for 3 days and then A leaves. How long (in days) will B take to complete the remaining work?
Asked in RRB NTPC 2026 — 17 June Shift 2 · Quantitative Aptitude
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Correct answer: (A) 6
In 3 days A and B (both 12-day workers) together complete 3*(1/12+1/12) = 1/2 of the work, leaving 1/2. At B's rate (1/12/day), B needs (1/2)/(1/12) = 6 more days.
हिंदी में प्रश्न
& और 12 एक काम को क्रमशः 12 और 3 दिनों में पूरा कर सकते हैं। दोनों 3 दिन तक काम करते हैं और फिर A काम छोड़कर चला जाता Fl AGT काम को पूरा करने में छ को कितने दिन लगेंगे?
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उत्तर और व्याख्या देखें
सही उत्तर: (A) 8
3 दिनों में A और B (दोनों 12-दिन के कर्मी) मिलकर 3*(1/12+1/12) = 1/2 कार्य पूरा करते हैं, शेष 1/2 बचता है। B की दर (1/12/दिन) से, B को (1/2)/(1/12) = 6 और दिन चाहिए।
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