IBPS Clerk Prelims practice question
A boat covers a distance of 85 km. The time it takes upstream and downstream is in the ratio 11:6. If the upstream journey takes 5 hours more than the downstream journey, find the speed of the boat in still water.
From a IBPS Clerk Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (B) 10.95 km/h
Let time upstream = 11k, time downstream = 6k.
Difference: 11k - 6k = 5 => 5k = 5 => k = 1.
Time upstream = 11 h, Time downstream = 6 h.
Upstream speed = 85/11 = 7.73 km/h. Downstream speed = 85/6 = 14.17 km/h.
Boat speed = (upstream+downstream)/2 = 10.95 km/h.
हिंदी में प्रश्न
एक नाव 85 किमी की दूरी तय करती है। इसे धारा के विपरीत और धारा के अनुकूल जाने में लगने वाले समय का अनुपात 11:6 है। यदि विपरीत यात्रा में अनुकूल यात्रा से 5 घंटे अधिक लगते हैं, तो शांत जल में नाव की चाल ज्ञात कीजिए।
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) 10.95 किमी/घंटा
माना विपरीत समय = 11k, अनुकूल समय = 6k।
अंतर: 11k − 6k = 5 => k = 1।
विपरीत समय = 11 घंटे, अनुकूल समय = 6 घंटे।
विपरीत चाल = 7.73 किमी/घंटा, अनुकूल चाल = 14.17 किमी/घंटा।
नाव की चाल = (विपरीत+अनुकूल)/2 = 10.95 km/h।
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