SSC GD Constable previous year question
Two trains having lengths of 170 m and 480 m are running at speeds of 70 km/h and 80 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: 05 Feb 2025 Shift 2 · Quantitative Aptitude
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Correct answer: (D) 3.9
Relative speed = 10 km/h = 2.78 m/s (approx); total length = 650 m; time = 650/2.78 ≈ 234 s ≈ 3.9 minutes.
हिंदी में प्रश्न
170 मीटर और 480 मीटर लंबाई वाली दो ट्रेनें क्रमशः 70 किमी/घंटा और 80 किमी/घंटा की गति से एक ही दिशा में चल रही हैं। पीछे से आ रही तेज़ ट्रेन को दूसरी ट्रेन को पूरी तरह पार करने में लगने वाला समय (मिनट में) है:
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सही उत्तर: (D) 3.9
सापेक्ष गति = 10 किमी/घंटा ≈ 2.78 मीटर/सेकंड; कुल लंबाई = 650 मीटर; समय = 650/2.78 ≈ 234 सेकंड ≈ 3.9 मिनट।
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