RRB NTPC CBT-1 previous year question
A train passes two persons walking in the same direction in which the train is going. These persons are walking at the rates of 2 km/hr and 4 km/hr, respectively, and are completely crossed by the train in 9 seconds and 10 seconds, respectively. What is the length of the train?
Asked in RRB NTPC 2026 — 15 June Shift 3 · Quantitative Aptitude
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Correct answer: (B) 50 meters
Let train speed = v km/h, length = L. Relative speeds to the two walkers give L=(v-2)(5/18)(9) and L=(v-4)(5/18)(10). Equating: 9(v-2)=10(v-4), giving v=22 km/h, so L=(22-2)×(5/18)×9=50 metres.
हिंदी में प्रश्न
एक ट्रेन दो व्यक्तियों के निकट से गुजरती है जो उसी दिशा में चल रहे हैं जिस दिशा में ट्रेन चल रही है। ये व्यक्ति क्रमशः 2 km/hr और 4 km/hr को चाल से चल रहे हैं तथा ट्रेन उन्हें क्रमशः 9 सेकेंड और 10 सेकंड में पूर्णतः पार कर जाती है। ट्रेन को लंबाई कितनी है?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (B) 75 मीटर
मान लें रेलगाड़ी की चाल = v किमी/घं, लंबाई = L। दोनों पैदल यात्रियों के सापेक्ष चाल से L=(v-2)(5/18)(9) और L=(v-4)(5/18)(10) मिलता है। बराबर करने पर: 9(v-2)=10(v-4), जिससे v=22 किमी/घं, अतः L=(22-2)×(5/18)×9=50 मीटर है।
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