i want to know how many hours by high speed train from Beijing to yinchuan and the ticket price

Oh, no high-speed train runs between these two places.
The normal speed train takes 16 to 18 hours on the way. The schedules are 02:37, 10:55, 13:36, 15:15 and 23:41 at Beijing Railway Station.
The ticket fare of soft sleeper is about CNY470 and hard sleeper is CNY310.
Or you can search the real time schedule on your own on this website.