Measure 45 minutes with two ropes
Quick Overview
This question evaluates logical and analytical reasoning about non-uniform processes, constraint-based problem solving, and temporal estimation skills. It is commonly asked in technical interviews to assess creative reasoning under strict constraints within the Coding & Algorithms domain and targets conceptual understanding of time-based reasoning rather than practical implementation.
Intersystems
Feb 12, 2026, 12:00 AM
Software Engineer
Technical Screen
Coding & Algorithms
1
0
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You have two ropes. Each rope takes exactly 60 minutes to burn completely, but each rope burns at a non-uniform rate (some parts burn faster than others). You have a lighter/matches, and you may light a rope at one end or both ends.
You do not have any other timing device.
Task: Describe a procedure that measures exactly 45 minutes.