SSC MTS practice question
A school bell (electric bell that rings in a clock-controlled sequence) strikes 4 times in 9 seconds, taking an equal amount of time between any two consecutive strikes. How many seconds will it take to strike 7 times?
From a SSC MTS Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (B) 18 seconds
When a clock strikes N times, there are only (N-1) gaps (intervals) between the strikes, not N. Here striking 4 times takes 9 seconds, so the number of intervals is (4-1) = 3, giving each interval = 9/3 = 3 seconds. To strike 7 times, the number of intervals is (7-1) = 6, so the time taken = 6 × 3 = 18 seconds.
हिंदी में प्रश्न
एक स्कूल की घंटी 4 बार बजने में 9 सेकंड लेती है, और किन्हीं भी दो लगातार घंटों के बीच बराबर समय लगता है। इसे 7 बार बजने में कितने सेकंड लगेंगे?
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सही उत्तर: (B) 18 सेकंड
जब घड़ी N बार बजती है, तो घंटों के बीच अंतराल (gap) की संख्या N नहीं बल्कि (N-1) होती है। यहाँ 4 बार बजने में 9 सेकंड लगते हैं, इसलिए अंतरालों की संख्या (4-1) = 3 है, अतः प्रत्येक अंतराल = 9/3 = 3 सेकंड। 7 बार बजने के लिए अंतरालों की संख्या (7-1) = 6 होगी, इसलिए लगने वाला समय = 6 × 3 = 18 सेकंड।
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