SSC GD Constable previous year question
Two trains having lengths of 210 m and 140 m are running at speeds of 80 km/h and 150 km/h, respectively, in the same direction. The time taken (in minutes) by the faster train, coming from behind, to completely cross the other train is:
Asked in SSC GD Constable 2025: 04 Feb 2025 Shift 1 · Quantitative Aptitude
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Correct answer: (B) 0.3
Total length = 350 m. Relative speed = (150−80) km/h = 70×5/18 m/s ≈ 19.44 m/s. Time = 350/19.44 ≈ 18 sec = 0.3 minutes.
हिंदी में प्रश्न
210 मीटर और 140 मीटर लंबाई की दो रेलगाड़ियाँ क्रमशः 80 किमी/घंटा और 150 किमी/घंटा की चाल से एक ही दिशा में चल रही हैं। पीछे से आ रही तेज़ रेलगाड़ी को दूसरी रेलगाड़ी को पूरी तरह पार करने में लगने वाला समय (मिनट में) है:
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सही उत्तर: (B) 0.3
कुल लंबाई = 350 मीटर। सापेक्ष चाल = (150−80) किमी/घंटा = 70×5/18 मी/से ≈ 19.44 मी/से। समय = 350/19.44 ≈ 18 सेकंड = 0.3 मिनट।
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