Speed, Time and Distance

Speed, Time and Distance – Verified PYQ Authority Guide

Speed, Time and Distance is organised as a topic-level PYQ authority page. It brings together the strongest verified question clusters, exam/year coverage and concept-level practice so students can revise the topic without jumping through unrelated notes. 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

69 verified PYQs are currently mapped to this 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.

1. A train runs at 72 km/h for 3 hours and then at 60 km/h for 1.5 hours. What is the average speed of the train?
   RRB NTPC Under Graduate Level · 2025 · Average Speed for Unequal Time Intervals
   Total distance = 72×3 + 60×1.5 = 216 + 90 = 306 km. Total time = 4.5 h. Average speed = 306/4.5 = 68…
2. A person travels half of a total distance at 30 km/h and the remaining half at 60 km/h. If the total distance is 120 km, how much time does the person take…
   RRB NTPC Under Graduate Level · 2025 · Speed Time Distance
   Use the standard Speed Time Distance method and simplify; the result matches 3 hours.
3. A cyclist travels from Town A to Town B, a distance of 78 km, at a speed of 13 km/h. He returns from Town B to Town A at a speed of…
   RRB NTPC Under Graduate Level · 2025 · Speed Time Distance
   Use the standard Speed Time Distance method and simplify; the result matches 9.
4. The area of a regular polygon with a side of 11 cm is 247.5 cm². If the perpendicular distance from the centre to the side of the polygon is 9 cm, what…
   RRB NTPC Under Graduate Level · 2025 · Speed Time Distance
   Use the standard Speed Time Distance method and simplify; the result matches 5.
5. A person walks 40 km at a speed of 5 km/hr, then runs 30 km at a speed of 10 km/hr. What is the ratio of walking time to running time?
   RRB NTPC Under Graduate Level · 2025 · Speed Time Distance
   Use the standard Speed Time Distance method and simplify; the result matches 8: 3.
6. A cyclist travels from point A to B and then returns from B to A along the same route. On the onward journey, he covers two-fifths of the distance at 15 km/hr…
   RRB NTPC Under Graduate Level · 2025 · Speed Time Distance
   Use the standard Speed Time Distance method and simplify; the result matches 19.32 km/hr.
7. A car travels a distance of 540 km. For the first 3 hours, it travels at a speed of 80 km/h, and for the remaining hours, it reduces its speed to 60…
   RRB NTPC Under Graduate Level · 2025 · Speed Time Distance
   Use the standard Speed Time Distance method and simplify; the result matches 8 hours.
8. A car travels 120 km at 40 km/h, 120 km at 60 km/h, and 100 km at 80 km/h. What is the average speed of the car for the whole journey?
   RRB NTPC Under Graduate Level · 2025 · Average Speed
   Use the standard Average Speed method and simplify; the result matches 54.4 km/h.

Formula & key-relationship bank from verified solutions

• Average Speed = Total Distance / Total Time
• Speed = Distance / Time; relative speeds add in opposite directions and subtract in the same direction
• Average = Sum of observations / Number of observations

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

• Total distance = 72×3 + 60×1.5 = 216 + 90 = 306 km. Total time = 4.5 h. Average speed = 306/4.5 = 68 km/h.
• Use the standard Speed Time Distance method and simplify; the result matches 3 hours.
• Use the standard Speed Time Distance method and simplify; the result matches 9.
• Use the standard Speed Time Distance method and simplify; the result matches 5.
• Use the standard Speed Time Distance method and simplify; the result matches 8: 3.

Exam tips already validated in SRO solutions

• Use total distance ÷ total time unless a special equal-distance shortcut is clearly applicable.
• Identify the Speed Time Distance relationship before calculation and keep units/bases consistent.
• Identify the Average Speed relationship before calculation and keep units/bases consistent.
• Identify the Relative Speed relationship before calculation and keep units/bases consistent.

Common mistakes to avoid

• Taking (72 + 60)/2 = 66 km/h even though the train spends different amounts of time at the two speeds.
• 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, Speed Time and Distance. The concept trail includes Speed Time Distance, Relative Speed, Average Speed, Average Speed for Unequal Time Intervals. 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 Arithmetic, Average Speed, Speed Time Distance, Trains, Quantitative Aptitude, Speed Time Distance, Relative Speed. 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

1. Solve before reading: answer a mapped PYQ first.
2. Read the exact explanation: verify the correct principle, formula, distractor logic and common mistake on that question page.
3. Move one level in the graph: use the closest concept/sub-topic/topic link rather than opening unrelated content.
4. 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.