Trains – Verified PYQ Authority Guide
Trains is a sub-topic revision hub built around verified PYQ evidence. It connects the recurring question patterns inside this sub-topic with the formulas, exam tips, common traps and concept pages already present in SRO. Every factual learning cue below is drawn from the existing verified, published and approved English PYQ corpus or from its Knowledge Graph relationships; the hub does not invent unsupported technical claims.
PYQ evidence snapshot
27 verified PYQs are currently mapped to this Sub Topic hub. The represented years include 2025. Exam coverage currently includes RRB NTPC Under Graduate Level. Subject context includes Quantitative Aptitude. These values come from live mappings and can expand automatically when new verified PYQs are added.
Most useful verified PYQs to solve first
Start with the actual questions rather than memorising a generic note. The links below are ranked from the mapped corpus using repeat history and editorial quality, while the complete explanation stays on the individual question page.
- Two trains, 130 meters and 120 meters long, are running in parallel tracks in the same direction at speeds of 62 km/hr and 44 km/hr, respectively. How much time will the faster…
RRB NTPC Under Graduate Level · 2025 · Relative Speed
Use the standard Relative Speed method and simplify; the result matches 50 seconds. - A faster train overtakes a slower train, both moving in the same direction. The faster train takes 36 seconds to completely pass the slower train. A passenger sitting in the faster train…
RRB NTPC Under Graduate Level · 2025 · Relative Speed
Use the standard Relative Speed method and simplify; the result matches 2: 1. - A man covers a certain distance by train. Had the train moved 14 km/hr faster, it would have taken 35 minutes less. If it moved 10 km/hr slower, it would have taken…
RRB NTPC Under Graduate Level · 2025 · Speed Time Distance
Use the standard Speed Time Distance method and simplify; the result matches 780 km. - Two trains of lengths 100 m and 150 m are moving in opposite directions at 40 km/h and 60 km/h, respectively. Find the time taken by the trains (in seconds) to cross…
RRB NTPC Under Graduate Level · 2025 · Relative Speed
Use the standard Relative Speed method and simplify; the result matches 9 seconds. - A train A passes a fixed pole in 24 seconds. The same train completely crosses another train B of length 150 m coming from the opposite direction in 20 seconds. Train B’s…
RRB NTPC Under Graduate Level · 2025 · Relative Speed
Use the standard Relative Speed method and simplify; the result matches 900 m and 135 km/h. - A train met with an accident 50 km away from station A. It completed the remaining journey at three-fourth of its original speed and reached station B 35 minutes late. Had the…
RRB NTPC Under Graduate Level · 2025 · Speed Time Distance
Use the standard Speed Time Distance method and simplify; the result matches 48 km/hr. - The ratio between the speeds of two trains is 5:8. If the second train covers 300 km in 3 hours, then find the speed of the first train.
RRB NTPC Under Graduate Level · 2025 · Speed Time Distance
Use the standard Speed Time Distance method and simplify; the result matches 62.5 km/h. - Two trains of equal lengths cross a stationary pole in 12 seconds and 16 seconds, respectively. How long will it take for the trains to cross each other when running in opposite…
RRB NTPC Under Graduate Level · 2025 · Relative Speed
Use the standard Relative Speed method and simplify; the result matches 13.71 seconds.
Formula & key-relationship bank from verified solutions
Speed = Distance / Time; relative speeds add in opposite directions and subtract in the same direction
Use these as revision triggers and open the linked PYQ before applying a formula numerically; variable definitions and assumptions belong to the exact solved question.
Core ideas repeatedly reinforced by the solved corpus
- Use the standard Relative Speed method and simplify; the result matches 50 seconds.
- Use the standard Relative Speed method and simplify; the result matches 2: 1.
- Use the standard Speed Time Distance method and simplify; the result matches 780 km.
- Use the standard Relative Speed method and simplify; the result matches 9 seconds.
- Use the standard Relative Speed method and simplify; the result matches 900 m and 135 km/h.
Exam tips already validated in SRO solutions
- Identify the Relative Speed relationship before calculation and keep units/bases consistent.
- Identify the Speed Time Distance relationship before calculation and keep units/bases consistent.
Common mistakes to avoid
- Using a shortcut without checking its conditions or using the wrong base/unit.
Topic and concept coverage
Mapped topic labels include Speed, Time and Distance. The concept trail includes Relative Speed, Speed Time Distance. Use these labels as a revision map: move from the broad area to the narrow concept, solve a verified PYQ, inspect the detailed reasoning, and then attempt another question from the same cluster.
Knowledge Graph navigation
Continue with Speed, Time and Distance, Relative Speed, Speed Time Distance, Speed Time Distance, Speed Time Distance, Speed Time Distance, Arithmetic, Quantitative Aptitude, Speed Time Distance. These are canonical SRO entity links based on the Knowledge Graph and shared question mappings, not keyword-stuffed tag pages.
How to revise this authority page efficiently
- Solve before reading: answer a mapped PYQ first.
- Read the exact explanation: verify the correct principle, formula, distractor logic and common mistake on that question page.
- Move one level in the graph: use the closest concept/sub-topic/topic link rather than opening unrelated content.
- Reattempt: solve another verified PYQ from this hub and check whether the same error repeats.
Quality scope: this page is automatically maintained from SRO’s verified mapped corpus. It enriches one canonical authority URL instead of generating multiple near-duplicate pages for keyword variants. Manual authority articles are never overwritten by the automated engine.