IBPS RRB Officer Scale-I Prelims practice question
Two trains, 132 m and 168 m long, run on parallel tracks in the same direction at 60 km/h and 42 km/h respectively. In how much time will the faster train completely cross the slower one?
From a IBPS RRB Officer Scale-I Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (A) 60 seconds
Since the trains move in the same direction, relative speed = (60 - 42) km/h = 18 km/h = 18 × 5/18 = 5 m/s. Total distance to be covered = sum of lengths = 132 + 168 = 300 m. Time = 300/5 = 60 seconds.
हिंदी में प्रश्न
132 मीटर और 168 मीटर लंबी दो रेलगाड़ियाँ समानांतर पटरियों पर एक ही दिशा में क्रमशः 60 किमी/घंटा और 42 किमी/घंटा की चाल से चल रही हैं। तेज़ रेलगाड़ी धीमी रेलगाड़ी को पूरी तरह पार करने में कितना समय लेगी?
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सही उत्तर: (A) 60 सेकंड
चूँकि दोनों रेलगाड़ियाँ एक ही दिशा में चल रही हैं, इसलिए सापेक्ष चाल = (60 - 42) किमी/घंटा = 18 किमी/घंटा = 18 × 5/18 = 5 मीटर/सेकंड। कुल तय की जाने वाली दूरी = दोनों की लंबाई का योग = 132 + 168 = 300 मीटर। समय = 300/5 = 60 सेकंड।
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