Look at the riddle again. It simply says do not assume the ropes are a certain length or they burn at the same speed. It simply says you have 2 ropes that could be any length that will burn up completely in 60 seconds. In order for this riddle to really work you have to assume each rope burns at a constant speed the whole length of the rope, so lighting the ropes at both ends would result in a 30 second burnination. The longer of the ropes will obviously burninate more material than the shorter one but in the same amount of time.
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