RRB Technician Grade 3 previous year question
The lengths of two trains starting from stations P and Q are in the ratio 3:2. When they run in opposite directions at speeds of 54 km/h and 72 km/h respectively, they cross each other in 30 seconds. The train starting from P crosses a bridge in 90 seconds. Find the length of the bridge.
Asked in RRB Technician Grade 3 (06 Mar 2026 Shift 2) · Quantitative Aptitude
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Correct answer: (A) 720 meters
Relative speed = (54+72) km/h = 35 m/s; sum of lengths = 35x30 = 1050 m = 5 parts (ratio 3:2), so length of P's train = 3x210 = 630 m. Bridge length = (54 km/h=15 m/s)x90 - 630 = 1350-630 = 720 m.
हिंदी में प्रश्न
स्टेशन P और Q से चलने वाली दो ट्रेनों की लंबाई का अनुपात 3:2 है। जब वे विपरीत दिशाओं में क्रमशः 54 km/h और 72 km/h की चाल से यात्रा करती हैं, तो वे एक-दूसरे को 30 सेकंड में पार कर लेती हैं। स्टेशन P से चलने वाली ट्रेन एक पुल को 90 सेकंड में पार करती है, तो पुल की लंबाई ज्ञात कीजिए।
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सही उत्तर: (A) 720 मीटर
सापेक्ष चाल = (54+72) किमी/घं = 35 मी/से; लंबाईयों का योग = 35×30=1050 मी = 5 भाग (अनुपात 3:2), अतः P की ट्रेन की लंबाई = 3×210=630 मी। पुल की लंबाई = (54किमी/घं=15मी/से)×90−630 = 1350−630 = 720 मी।
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