In April 2026, which country successfully tested 'Project Kuiper-2', an advanced low-earth orbit (LEO) satellite constellation for high-speed internet?
In March 2026, which country unveiled the 'Silk-Road Digital Rail', a cross-border optical fiber network connecting 10 nations for high-speed cloud computing?
A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/h, what is the length of the platform?