IBPS RRB Office Assistant (Multipurpose) Prelims practice question
A man can row at 20 km/h in still water and the speed of the stream is 8 km/h. If he takes 5 hours to go to a certain place and return, find the distance of the place.
From a IBPS RRB Office Assistant (Multipurpose) Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (A) 42 km
Downstream speed = 28 km/h, Upstream speed = 12 km/h. Let distance = x km. x/28 + x/12 = 5. Solving, x(12+28)/(28*12) = 5, so x*40/336 = 5, giving x = 42 km.
हिंदी में प्रश्न
एक आदमी शांत पानी में 20 किमी/घंटा की चाल से नाव चला सकता है तथा धारा की चाल 8 किमी/घंटा है। यदि वह किसी स्थान तक जाने और वापस आने में 5 घंटे लेता है, तो उस स्थान की दूरी ज्ञात करें।
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सही उत्तर: (A) 42 किमी
धारा के अनुकूल चाल = 28 किमी/घंटा, धारा के प्रतिकूल चाल = 12 किमी/घंटा। मान लीजिए दूरी = x किमी। x/28 + x/12 = 5. हल करने पर x*40/336 = 5, अतः x = 42 किमी।
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