Hard
Math and Logic
Two 1-hr ropes, burn inconsistently. Measure 45 mins?
Choose an answer
A.Light one end and wait
B.Cut one in half
C.Light one at 15m
D.Light ends of R1, 1 end of R2
Answer: Light ends of R1, 1 end of R2
Lighting both ends of a 60m rope makes it burn in 30m. By lighting one end of Rope 2 at the same time, it has 30m left when Rope 1 finishes. Lighting its other end then gives 15m.
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