Well the solution is simple.First take one of the rope and put it's both the ends on fire.Since it takes 1 hour to completely burn a rope but if you put the fire from both the ends it will take only 0.5 hour to burn it.
As soon as the 1st rope is burnt completely take the second rope and put it on fire. it will take 1 hour to burn completely.
So in total we can measure 1.5 hours using both the ropes.
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