RRB NTPC CBT-1 previous year question
Two trains of lengths 120 m and 180 m are moving in the same direction at speeds of 60 km/h and 40 km/h, respectively. Find the time taken by the trains to cross each other.
Asked in RRB NTPC 2026 — 17 June Shift 2 · Quantitative Aptitude
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Correct answer: (A) 54 seconds
Relative speed for same-direction motion = 60-40 = 20 km/h = 50/9 m/s. Total length to cross = 120+180 = 300 m. Time = 300/(50/9) = 54 seconds.
हिंदी में प्रश्न
120 m और 180 m लंबाई की दो ट्रेनें एक ही दिशा में क्रमशः 60 km/h और 40 km/h की चाल से चल रही हैं। ट्रेनों द्वारा एक-दूसरे को पार करने में लगने वाला समय ज्ञात कोजिए।
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (A) 76.9 सैकंड ।
समान दिशा में गति के लिए सापेक्ष गति = 60-40 = 20 किमी/घं = 50/9 मी/से। पार करनी कुल लंबाई = 120+180 = 300 मी। समय = 300/(50/9) = 54 सेकंड।
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