Why is ping to Google servers and Google DNS so low?

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http://serverfault.com – I noticed that ping to Google DNS and to google.com from Serbia is about 15ms, but google servers are located in California! http://www.geoiptool.com/en/?IP= My dedicated server is located in Germany and our countries are close, but ping is 43ms. What is the secret? Can I reduce ping to my server somehow? (HowTos)