Relative Speed – Verified PYQ Authority Guide
Relative Speed is treated here as a focused concept hub. The aim is to show exactly how this concept appears across verified PYQs, which formulas or relationships recur in the solved corpus, and which nearby concepts deserve revision next. 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
14 verified PYQs are currently mapped to this Concept 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 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
Use the standard Relative Speed method and simplify; the result matches 13.71 seconds. - Two trains of lengths 120 m and 180 m are moving in the same direction at speeds of 60 km/h and 40 km/h, respectively. Find the time taken by the trains to…
RRB NTPC Under Graduate Level · 2025
Use the standard Relative Speed method and simplify; the result matches 54 seconds. - Two trains P and Q, measure 200 m and 300 m in length, respectively. The faster train, coming from behind, takes 48 seconds to overtake the slower when moving in the same…
RRB NTPC Under Graduate Level · 2025
Use the standard Relative Speed method and simplify; the result matches 63.75 km/h. - Two trains are running on parallel tracks in the same direction. Train A is 90 m long and moves at 54 km/h. Train B is 75 m long and moves at 36…
RRB NTPC Under Graduate Level · 2025
Use the standard Relative Speed method and simplify; the result matches 33 seconds. - Two trains of lengths 160 meters and 140 meters are moving in opposite directions at 55 km/h and 65 km/h, respectively. Find the time taken by them to cross each other completely.
RRB NTPC Under Graduate Level · 2025
Use the standard Relative Speed method and simplify; the result matches 9 seconds. - 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…
RRB NTPC Under Graduate Level · 2025
Use the standard Relative Speed method and simplify; the result matches 50 meters. - Patna Express leaves Delhi at 10:00 AM and reaches Patna at 7:00 PM the same day. Delhi Express leaves Patna at 2:00 PM and reaches Delhi at 1:00 AM on the next…
RRB NTPC Under Graduate Level · 2025
Use the standard Relative Speed method and simplify; the result matches 04:45PM. - Two trains are moving in opposite directions at speeds of 36 km/h and 54 km/h. If their lengths are 100 m and 150 m, respectively, how much time will they take to…
RRB NTPC Under Graduate Level · 2025
Use the standard Relative Speed method and simplify; the result matches 10 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 13.71 seconds.
- Use the standard Relative Speed method and simplify; the result matches 54 seconds.
- Use the standard Relative Speed method and simplify; the result matches 63.75 km/h.
- Use the standard Relative Speed method and simplify; the result matches 33 seconds.
- Use the standard Relative Speed method and simplify; the result matches 9 seconds.
Exam tips already validated in SRO solutions
- Identify the Relative Speed 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. 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 Trains, Speed, Time and Distance, Arithmetic, Quantitative Aptitude. 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.