SBI Clerk Prelims practice question
A clock loses 40 minutes in a day (24 hours). It was set right at 11 p.m. on a Sunday. After how many days will it show the correct time again?
From a SBI Clerk Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (C) 18 days
A 12-hour dial shows the correct time again when the total error reaches 12 hours = 720 minutes (not 24 hours = 1440 minutes). Error per day = 40 minutes, so the required time = 720/40 = 18 days.
हिंदी में प्रश्न
एक घड़ी एक दिन (24 घंटे) में 40 मिनट पीछे हो जाती है। इसे रविवार को अपराह्न 11 बजे सही किया गया। कितने दिनों बाद यह पुनः सही समय दिखाएगी?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (C) 18 दिन
12 घंटे का डायल तब पुनः सही समय दिखाता है जब कुल त्रुटि 12 घंटे = 720 मिनट हो जाए (24 घंटे = 1440 मिनट नहीं)। प्रतिदिन त्रुटि = 40 मिनट, अतः अभीष्ट समय = 720/40 = 18 दिन।
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