Galvanized metal is thick and sweep regularly. Very long inside the pipes with water is full. Khokchang, plumbing, piping, steel clamp with one strong, knocking twice during his time away displaystyle frac {1} {2} seconds sound waves that occur on the metal with the speed of 4,000 meters per second and the water in 1,400 meters per second. Find the location where the water pipes will rattle more than usual. By measuring the point tap
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