Light transfer ping value delay calculation! And which engine room is the fastest American room in China?

USA Santa Ana kt engine room/US kt engine room/US KT server
KT Machine room is the fastest in the United States to the mainland, the largest computer room, ping value is generally 195MS, is to do Web server's preferred room, by small and medium-sized webmaster welcome!
We usually test the speed of the United States server, are judged by the ping value. (Ping the United States a server, data requests in the past, and then back, the time required is what we often call ping value),
However, there are some IDC providers that boast that his ping is less than 100, first of all, I can certainly tell you that his ping value is less than 100 of the U.S. server is absolutely bluffing you. China and the United States are half the Earth,
Light one second 300,000 kilometers, around the earth 7.5 laps, 1 seconds =1000 milliseconds, the earth half lap speed is 1000/15=66 milliseconds, the data return takes the same time. Plus the routing time between the two sides to the sea cable, the ping between the U.S. and China servers, the best expected value is 180ms!

Light transfer ping value delay calculation! And which engine room is the fastest American room in China?