Q: The place where a river meets the sea is called a(n) __________. A. estuary B. isthmus C. escarpment D. peninsula. A: Place where river meets sea is estuary. Log in to see link for more information.
Although The Guinness Book of Records recorded the XF-84H as the fastest propeller-driven aircraft ever built, with a design top speed of 670 mph (1,080 km/h) (Mach 0.9) and 623 mph (1,003 km/h) (Mach 0.83) during tests, this claim has been disputed.
Guinness World Records recognized NASA's X-43A scramjet with a new world speed record for a jet-powered aircraft - Mach 9.6, or nearly 7,000 mph. Answer The fastest speed wasâ¦ recorded by an unmanned aircraft called X-43. It can reach the speed of almost 7460 miles per hour. The fastest manned aircraft is X-15. Its top speed is 5115 miles per hour. This is very, very fast. Different ways of flight propulsion must have different categories as fastest in their method of power, to allow for this question to be answered properly. However, the overall fastest flight reached is Mach 9.8, which is about 12,144 km/h.