Bit express 21tr1 miner

1. If the speed of express train is x, the high-speed rail is 3.5x
1463 ÷ x-1463 ÷ 3.5x=10
1463/x-418/x=10
1045/x=10
x=1045 ÷ 10
x = 104.5
104.5x3 = 313.5 (km / h)
A: the express speed is 104.5 km / h and the high-speed rail is 313.5 km / h

2. DNS operates in a layer way. For example, the domain name of the lilac station of Harbin Institute of technology is bbs.hit.e.cn. Of course, this domain name does not come out of thin air, but is assigned from. E.cn e. Cn is also granted from. CN Where does CN come from? The answer comes from ".", the so-called root domain. The root domain is already at the top of domain name. The "." layer is managed by InterNIC (Internet Network Information Center). Domain names all over the world are granted layer by layer.