RRB Group D practice question
A man can row at 18 km/h in still water and the speed of the stream is 15 km/h. If he takes 8 hours to go to a certain place and return, find the distance of the place.
From a RRB Group D Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (D) 22 km
Downstream speed = 33 km/h, Upstream speed = 3 km/h. Let distance = x km. x/33 + x/3 = 8. Solving, x(3+33)/(33*3) = 8, so x*36/99 = 8, giving x = 22 km.
हिंदी में प्रश्न
एक आदमी शांत पानी में 18 किमी/घंटा की चाल से नाव चला सकता है तथा धारा की चाल 15 किमी/घंटा है। यदि वह किसी स्थान तक जाने और वापस आने में 8 घंटे लेता है, तो उस स्थान की दूरी ज्ञात करें।
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सही उत्तर: (D) 22 किमी
धारा के अनुकूल चाल = 33 किमी/घंटा, धारा के प्रतिकूल चाल = 3 किमी/घंटा। मान लीजिए दूरी = x किमी। x/33 + x/3 = 8. हल करने पर x*36/99 = 8, अतः x = 22 किमी।
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