RRB NTPC CBT-1 practice question
Yusuf rides a truck from the quarry to the depot and back, covering the same distance in both directions. Going, he maintains a speed of 44 km/h, and returning over the identical distance, the speed is 66 km/h. Find the average speed for the whole trip.
From a RRB NTPC CBT-1 Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (D) 52.8 km/h
For a journey covering equal distances at two speeds a = 44 km/h and b = 66 km/h, average speed = 2ab/(a+b) = (2×44×66)/(44+66) = 5808/110 = 52.8 km/h.
हिंदी में प्रश्न
यूसुफ ट्रक से खदान से डिपो तक जाता/जाती है और वापस भी उतनी ही दूरी तय करता/करती है। जाते समय यूसुफ की चाल 44 किमी/घंटा रहती है और वापसी में उसी दूरी पर चाल 66 किमी/घंटा रहती है। पूरी यात्रा की औसत चाल ज्ञात कीजिए।
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सही उत्तर: (D) 52.8 km/h
जब यात्रा में बराबर दूरी दो अलग-अलग चालों a = 44 किमी/घंटा और b = 66 किमी/घंटा से तय की जाती है, तो औसत चाल = 2ab/(a+b) = (2×44×66)/(44+66) = 5808/110 = 52.8 किमी/घंटा होती है।
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