KöMaL 2013 K362
Peter takes 5 hours to do a certain job alone, and Paul takes 6 hours to do the same job alone. When they work together, they are both behindered by their continual quarrelling about everything, and their productivity decreases: each of them will do the work at a rate lowered by the same percentage. By what percentage is it lowered if the two of them take 3.5 hours to finish the job together?
Official text KöMaL. Quoted with source.
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