RRB NTPC CBT-1 previous year question
A cyclist travels from point A to B and back from B to A along the same route. On the onward journey, he covers one-third of the distance at 12 km/hr and the remaining distance at 18 km/hr. On the return journey, he covers half of the distance at 9 km/hr and the remaining distance at 18 km/hr. Find the average speed (in km/hr) for the entire round trip.
Asked in RRB NTPC 2026 — 17 June Shift 2 · Quantitative Aptitude
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Correct answer: (B) 13.5 km/hr
For a one-way distance D: onward time = (D/3)/12+(2D/3)/18 = D/54*3=D/18; return time=(D/2)/9+(D/2)/18=D/12. Total distance=2D, total time = D/18+D/12=5D/36. Average speed=2D/(5D/36)=72/5=13.5 km/hr.
हिंदी में प्रश्न
एक साइकिल सवार बिंदु & से 8 तक और फिर BSA तक एक ही मार्ग पर यात्रा करता él जाते समय वह एक तिहाई दूरी 12 km/hr का चाल स॑ और शेष दूरी 18 km/hr की चाल से तय करता el लौटते समय वह आधी दूरी 9 km/hr को चाल से और शेष दूरी 18 kmV/hr की चाल से तय करता है। पूरी यात्रा के लिए SRA चाल (km/hr में) ज्ञात कोजिए।
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) 15 km/hr
एकतरफा दूरी D के लिए: जाने का समय = D/18; लौटने का समय = D/12। कुल दूरी = 2D, कुल समय = 5D/36। औसत गति = 2D/(5D/36) = 72/5 = 13.5 किमी/घंटा।
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