Time and Work – Verified PYQ Authority Guide
Time and Work 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
44 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.
- A tank is full. Pipes A and B can drain the tank in 10 hours and 15 hours, respectively, while pipe C can fill the tank in 12 hours. Pipes A and…
RRB NTPC Under Graduate Level · 2025 · Combined Filling and Emptying
Use the standard Combined Filling and Emptying method and simplify; the result matches 10 hours. - Pipe A can fill a cistern in 10 hours, pipe B in 15 hours, and pipe C can empty it in 30 hours. All three pipes are opened together. After 6 hours,…
RRB NTPC Under Graduate Level · 2025 · Combined Filling and Emptying
Use the standard Combined Filling and Emptying method and simplify; the result matches 12 hours. - A and B can complete a piece of work in 12 days and 6 days, respectively. Both work together for 2 days and then A leaves. B completes the remaining work alone.…
RRB NTPC Under Graduate Level · 2025 · Work Rate
Use the standard Work Rate method and simplify; the result matches 5. - Pipes, A and B, can fill a tank in 10 hours. Pipes, B and C, can fill the same tank in 20 hours. If pipe B alone can fill the same tank…
RRB NTPC Under Graduate Level · 2025 · Combined Filling and Emptying
Use the standard Combined Filling and Emptying method and simplify; the result matches 12 hours. - Pipes C and D can fill a tank of 3,000 litres in 6 hours and 4 hours, respectively. Working together, how many hours will they take to fill a 6,000-litre tank?
RRB NTPC Under Graduate Level · 2025 · Combined Filling and Emptying
Use the standard Combined Filling and Emptying method and simplify; the result matches 4.8 hours. - A and B can do a piece of work in 12 days and 6 days, respectively. Both work for 2 days and then A leaves. B completed the remaining work alone. The…
RRB NTPC Under Graduate Level · 2025 · Work Rate
Use the standard Work Rate method and simplify; the result matches 5. - Pipes A, B and C can together fill a tank in 6 hours. After working together for 2 hours, C is closed and A and B together fill the remaining part in…
RRB NTPC Under Graduate Level · 2025 · Combined Filling and Emptying
Use the standard Combined Filling and Emptying method and simplify; the result matches 14. - Two pipes, A and B, can fill a tank in 20 minutes and 30 minutes, respectively. A waste pipe C can empty it in 60 minutes. All three are opened together. After…
RRB NTPC Under Graduate Level · 2025 · Combined Filling and Emptying
Use the standard Combined Filling and Emptying method and simplify; the result matches 14 minutes.
Formula & key-relationship bank from verified solutions
Work/Filling rate = 1 ÷ time; net rate = filling rates − emptying rates
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 Combined Filling and Emptying method and simplify; the result matches 10 hours.
- Use the standard Combined Filling and Emptying method and simplify; the result matches 12 hours.
- Use the standard Work Rate method and simplify; the result matches 5.
- Use the standard Combined Filling and Emptying method and simplify; the result matches 4.8 hours.
- Use the standard Combined Filling and Emptying method and simplify; the result matches 14.
Exam tips already validated in SRO solutions
- Identify the Combined Filling and Emptying relationship before calculation and keep units/bases consistent.
- Identify the Work Rate 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 Time and Work. The concept trail includes Combined Filling and Emptying, Work Rate. 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, Pipes and Cisterns, Time and Work, Quantitative Aptitude, Combined Filling and Emptying, Work Rate. 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.