SSC GD Constable previous year question
The speed of a stream is 9 km/h. A boat can cover a distance of 56 km downstream and 28 km upstream in 7 hours. Find the speed of the boat in still water (in km/h).
Asked in SSC GD Constable 2025: 04 Feb 2025 Shift 3 (Evening) · Quantitative Aptitude
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Correct answer: (D) 15
Let boat speed = x. Then 56/(x+9) + 28/(x-9) = 7. Solving this equation gives x = 15 km/h.
हिंदी में प्रश्न
एक धारा की चाल 9 km/h है। एक नाव धारा के अनुकूल 56 km और धारा के प्रतिकूल 28 km की दूरी 7 घंटे में तय कर सकती है। स्थिर जल में नाव की चाल (km/h में) ज्ञात कीजिए।
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सही उत्तर: (D) 15
मान लीजिए नाव की चाल = x। तब 56/(x+9) + 28/(x-9) = 7। इस समीकरण को हल करने पर x = 15 km/h प्राप्त होता है।
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