Directions: Read the given information and answer the question based on it.…
2023
Directions: Read the given information and answer the question based on it. There are four platforms in a railway station. The platforms open at different times one after the other such that platform 1 opens at 5am, platform 2 opens at 6am, platform 3 opens at 7am and platform 4 opens at 8am. Some trains arrive at these platforms one by one at a gap of 1 hour i.e., if train X arrived at platform 1 at 5am, then train Y will arrive at platform 1 at 6am. Multiple trains can arrive at a single platform but having a 1 hour gap in their arrival.
Read the following statements to get the desired output:
1. Train M is not the single train to arrive on a platform.
2. Train D arrives just before train B on the same platform.
3. One hour arrival gap between train G and train H on the same platform.
4. No train arrives after train C, which also arrives on one of the platforms at 6am.
5. Arrival time of train G and train B is same, where train B arrives on platform 1.
6. The train which first arrives at 5am on platform 1, next arrives at 7am on platform 3.
7. Train K arrives at platform 1 before train S, on platform 2.
8. Train H arrives at platform 2 at 7am.
How many trains arrive on all the platforms (consider a train only once)?
- A.
Six
- B.
Seven
- C.
Nine
- D.
Eight
- E.
None of the above
Attempted by 2 students.
Show answer & explanation
Correct answer: D
Concept
In a puzzle that asks for the count of distinct entities, the answer depends only on how many UNIQUE names appear across all the statements — not on where each entity is finally placed. Solving the full arrangement is unnecessary; a name repeated in several clues is still counted once.
Application
Scan every statement and collect each train identifier the first time it appears:
Clue 1 introduces M.
Clue 2 introduces D and B.
Clue 3 introduces G and H.
Clue 4 introduces C.
Clue 5 repeats G and B (already counted).
Clue 6 describes a movement (5am Platform 1 to 7am Platform 3) but names no new train.
Clue 7 introduces K and S.
Clue 8 repeats H (already counted).
Collecting the unique identifiers gives the set: M, D, B, G, H, C, K, S.
Cross-check
Counting that set element by element — M(1), D(2), B(3), G(4), H(5), C(6), K(7), S(8) — yields 8. Clues that only re-state already-named trains (5 and 8) and the movement clue (6) add nothing to the tally, confirming the count is exactly eight.
Hence, considering each train only once, the number of trains that arrive is Eight.