The Lumin Archive
TIER 4 — CHALLENGE 001 — The Echo Ridge Problem - Printable Version

+- The Lumin Archive (https://theluminarchive.co.uk)
+-- Forum: The Lumin Archive — Core Forums (https://theluminarchive.co.uk/forumdisplay.php?fid=3)
+--- Forum: Challenge Arena (https://theluminarchive.co.uk/forumdisplay.php?fid=11)
+---- Forum: Tier 4–6 : Intermediate Challenges (https://theluminarchive.co.uk/forumdisplay.php?fid=41)
+----- Forum: Tier 4 Challenges — Intermediate (https://theluminarchive.co.uk/forumdisplay.php?fid=59)
+----- Thread: TIER 4 — CHALLENGE 001 — The Echo Ridge Problem (/showthread.php?tid=150)



TIER 4 — CHALLENGE 001 — The Echo Ridge Problem - Leejohnston - 11-14-2025

[border]TIER 4 — Applied Reasoning[/border]

Tier 4 — Challenge 001 — The Echo Ridge Problem

You stand between two cliffs: Cliff A and Cliff B. 
You clap your hands and hear **two echoes**:

• The first echo arrives after **2.4 seconds** 
• The second echo arrives after **3.8 seconds**

Assume:
• Speed of sound ≈ **340 m/s** 
• You are standing **somewhere between the two cliffs**, not centred

Question: 
How far are you from each cliff?

Explain your reasoning clearly.



? Submit Your Attempt 
Thread title: 
Tier 4 Attempt — YourUsername — Challenge 001