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Medium · Brainteasers · Quant Trader interview question · lateral-thinking, measurement, time-logic
You have two fuses (ropes). Each rope takes exactly 60 minutes to burn from end to end. However, the ropes are not uniform; they may burn fast in some sections and slow in others (e.g., the first half might burn in 10 minutes and the second half in 50 minutes). You have a lighter but no watch. How can you measure exactly 45 minutes?