India on Monday joined the elite club of countries that have developed and successfully tested the hypersonic technology. Only US, Russia and China have achieved this feat so far. The achievement has paved the way for development of missiles travelling at six times the speed of sound. The test of Hypersonic Test Demonstrator Vehicle, developed by DRDO was conducted on Monday at the APJ Abdul Kalam testing range in Odisha's Balasore. The test lasted for five minutes using Agni missile booster. At 11.03 am, an Agni missile booster took the hypersonic vehicle to height of 30 km after which the latter separated. Thereafter, the vehicle’s air intake opened and that led to successfully firing of the test scramjet engine. The combustion lasted for more than 20 seconds with the vehicle achieving a speed of six Mach.