RRB NTPC CBT-1 previous year question
A and B can do a piece of work in 12 days and 24 days, respectively. Both work for 2 days and then A leaves. How long (in days) will B take to complete the remaining work?
Asked in RRB NTPC 2026 — 14 June Shift 3 · Quantitative Aptitude
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Correct answer: (D) 18
In 2 days A and B together complete 2*(1/12+1/24)=1/4 of the work, leaving 3/4. At B's rate of 1/24 per day, the remaining work takes (3/4)/(1/24)=18 days.
हिंदी में प्रश्न
AR 12 एक काम को क्रमशः 24 और 2 दिनों में पूरा कर सकते हैं। दोनों 2 दिन काम करते हैं और फिर # काम छोड़कर चला जाता है। शेष काम को पूरा करने में 8 को कितने दिन लगेंगे?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (D) 19
2 दिनों में A और B साथ मिलकर 2*(1/12+1/24)=1/4 काम पूरा करते हैं, शेष 3/4 रहता है। B की दर 1/24 प्रतिदिन पर, शेष काम में (3/4)/(1/24)=18 दिन लगते हैं।
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