SSC GD Constable previous year question
The speed of a stream is 9 km/h. A boat can go 56 km downstream and 28 km upstream in 7 hours. What is the speed (in km/h) of the boat in still water?
Asked in SSC GD Constable 2025: 04 Feb 2025 Shift 3 · Quantitative Aptitude
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Correct answer: (D) 15
Let boat speed = x; 56/(x+9) + 28/(x−9) = 7. Solving, x = 15 km/h satisfies the equation.
हिंदी में प्रश्न
एक धारा की गति 9 किमी/घंटा है। एक नाव 7 घंटों में 56 किमी धारा के अनुकूल और 28 किमी धारा के प्रतिकूल जा सकती है। शांत जल में नाव की गति (किमी/घंटा में) क्या है?
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सही उत्तर: (D) 15
नाव की गति x मानें; 56/(x+9) + 28/(x−9) = 7। हल करने पर, x = 15 किमी/घंटा समीकरण को संतुष्ट करता है।
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