RRB NTPC CBT-1 previous year question
A train overtakes two runners moving in the same direction at speeds of 5 km/h and 7 km/h, passing them completely in 18 seconds and 20 seconds, respectively. What is the length of the train (in metres)?
Asked in RRB NTPC 2026 — 14 June Shift 2 · Quantitative Aptitude
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Correct answer: (D) 100
Let the train's speed be v km/hr. Since L=(v-5)*(5/18)*18=(v-7)*(5/18)*20, solving 5(v-5)=50(v-7)/9 gives v=25 km/hr, so the train's length L=(25-5)*5=100 m.
हिंदी में प्रश्न
एक ट्रेन km/h और 5 km/h की चाल से एक ही दिशा में दौड़ रहे दो धावकों को क्रमशः 7 सेकंड और 20 सेकंड में पार कर जाती Sl ट्रेन का Hale (मीटर में) कितनी है?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (D) 90
मान लें ट्रेन की गति v किमी/घंटा है। L=(v-5)*(5/18)*18=(v-7)*(5/18)*20 से, 5(v-5)=50(v-7)/9 हल करने पर v=25 किमी/घंटा मिलता है, इसलिए ट्रेन की लंबाई L=(25-5)*5=100 मीटर है।
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