What was the maximum speed of the X-15 rocket plane?
4,520 mph
2,500 mph
3,500 mph
6,000 mph
Answer
The X-15 rocket plane, developed by North American Aviation, was an experimental aircraft designed to explore the limits of high-speed flight. It set numerous speed and altitude records, reaching a top speed of 4,520 mph (7,274 km/h) and an altitude of 354,200 feet (67 miles; 108 km). The X-15 program provided valuable data for future spacecraft design.
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