SBI PO Prelims practice question
A bus travels for 2 hours at 80 km/h, then for 1 hour at 50 km/h and finally for 2 hours at 30 km/h. What is the average speed of the bus for the entire journey?
From a SBI PO Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (B) 54 km/h
Distances: 80 × 2 = 160 km, 50 × 1 = 50 km, 30 × 2 = 60 km; total = 270 km in 5 hours. Average speed = 270/5 = 54 km/h. (When the TIMES are equal the answer equals the simple mean; here they are not, so 53.33 km/h is wrong.)
हिंदी में प्रश्न
एक बस 2 घंटे 80 किमी/घंटा की चाल से, फिर 1 घंटे 50 किमी/घंटा की चाल से और अंत में 2 घंटे 30 किमी/घंटा की चाल से चलती है। पूरी यात्रा में उसकी औसत चाल क्या है?
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सही उत्तर: (B) 54 किमी/घंटा
दूरियाँ: 80 × 2 = 160 किमी, 50 × 1 = 50 किमी, 30 × 2 = 60 किमी; कुल = 270 किमी, 5 घंटे में। औसत चाल = 270/5 = 54 किमी/घंटा। (जब समय बराबर हों तभी उत्तर साधारण माध्य होता है; यहाँ नहीं, इसलिए 53.33 किमी/घंटा गलत है।)
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