RRB NTPC CBT-1 previous year question
A and B can do a piece of work in 12 days and 18 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 1 · Quantitative Aptitude
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Correct answer: (C) 13
A and B's combined rate = 1/12+1/18 = 5/36 per day. In 2 days they complete 10/36=5/18 of the work, leaving 13/18. B alone (rate 1/18) takes 13/18 ÷ 1/18 = 13 days to finish.
हिंदी में प्रश्न
AS 12 एक काम को क्रमशः 18 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: (C) 15 . “3 5
A और B की संयुक्त दर = 1/12+1/18 = 5/36 प्रति दिन। 2 दिनों में वे 10/36=5/18 कार्य पूरा करते हैं, शेष 13/18 बचता है। B अकेले (दर 1/18) से 13/18 ÷ 1/18 = 13 दिनों में पूरा करेगा।
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