RRB NTPC CBT-1 previous year question
A and B can do a piece of work in 12 days and 28 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 1 · Quantitative Aptitude
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Correct answer: (C) 18
In 3 days A and B together complete 3*(1/12+1/28) = 11/21 of the work, leaving 10/21. At B's rate (1/28/day), B needs (10/21)/(1/28) = 18 more days.
हिंदी में प्रश्न
& और 12 एक काम को क्रमशः 28 दिन और 3 दिन में पूरा कर सकते हैं। दोनों 3 दिन काम करते हैं और फिर A काम छोड़कर चला जाता Fl AGT काम को पूरा करने में छ को कितने दिन लगेंगे?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (C) 17
3 दिनों में A और B मिलकर 3*(1/12+1/28) = 11/21 कार्य पूरा करते हैं, शेष 10/21 बचता है। B की दर (1/28/दिन) से, B को (10/21)/(1/28) = 18 और दिन चाहिए।
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