The Detective’s DeskGalen Oak
Recorded account
“My complete ride took 20 seconds.”
MEDIUM · CASE FILE
The service lift report
Medium · MAPLE STORAGE TOWER
Four staff describe continuous lift rides. The automatic lift has one fixed timing rule and never stops between the stated floors. Also reconstruct the review register: it records who examined which source, independently of whether their later proposed answer is correct. Review slots describe order, not travel or clock times.
Read the case file below, or open the interactive desk to examine records, keep notes and submit your reasoning. These are the case materials, without the solution.
Your assignment
Whose claimed ride duration is impossible?
- The analytical records answer the analytical question; worksheet records establish the review reconstruction. Candidate proposals and supplementary recollections are claims to test.
- There are 2 ordered events. Use each listed person and item once in its column. “A immediately before B” means A is in the row directly above B, with no row between them.
- 4 verified records support the complete submission. Keep the separate context note out of the proof.
- No outside facts or unstated exceptions are required. The complete board and report are assessed together.
People and accounts
Hedi Gray
Recorded account
“My complete ride took 22 seconds.”
Ilan West
Recorded account
“My complete ride took 34 seconds.”
Juna Lake
Recorded account
“My complete ride took 18 seconds.”
Case records
Read each record on its own terms. A claim made by a person is different from a fact established by an independent record.
CONTEXT NOTE
Cargo log
Each rider carried one empty trolley.
All recorded timings already apply to these rides.
PRIMARY RECORD
Lift timing plate
Each floor travelled takes exactly 4 seconds. Opening and closing the doors adds exactly 10 seconds to every complete ride, regardless of distance.
This gives travel rate and fixed overhead.
LINKED RECORD
Verified ride endpoints
Galen rode from floor 1 to 5; Hedi from 2 to 5; Ilan from 0 to 6; Juna from 4 to 6. No ride made any intermediate stop.
This establishes the number of floors travelled for each person.
RECONSTRUCTION RECORD
Review register
This is the same investigation’s document review record. There are 2 ordered events, labelled Review 1, Review 2. Each listed person and item occurs exactly once. These slots describe record order, not times from the analytical problem.
- The event reviewed by Galen Oak occupies slot 2 (Review 2).
Use each column’s choices exactly once. Verified relationships govern the board; proposed answers and later recollections do not override them.
RECONSTRUCTION RECORD
Review cross-check
The relationships below were verified independently. “A immediately before B” means A is in the row directly above B, with no row between them. Keep relationships from all worksheet sources together.
- The event involving “Verified ride endpoints” occupies slot 1 (Review 1).
Use each column’s choices exactly once. Verified relationships govern the board; proposed answers and later recollections do not override them.
Questions to resolve
Match every recorded item to its handler or reviewer.
- Verified ride endpoints
- Lift timing plate
When was the primary analytical record reviewed?
Use the interactive case desk to select your finding and cite the records that support it. The answer is checked there, and your progress stays in your browser.
Build your finding
Compare the records with each account. Work out what the evidence establishes, then separate that finding from anything it does not prove.