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Boost phase - typical burnout speed is 4 km/s (2.5 mi/s), up to 7.8 km/s (4.8 mi/s)
Reentry phase - impact is at a speed of up to 7 km/s (4.3 mi/s)
The high speeds of the warheads make them difficult to intercept and allow for little warning, striking targets many thousands of kilometers away from the launch site (and due to the possible locations of the submarines: anywhere in the world) within approximately 30 minutes.
originally posted by: JimTSpock
OK ICBMs and SLBMs speed.
Hypersonic anti-ship missiles with conventional warheads will turn any surface combatants into scrap fairly rapidly if enough of them are used, including aircraft carriers.
Russia's Monster Battlecruisers Are Getting Hypersonic Anti-Ship Missiles
There is very little information available about the performance of the Zircon missile. However, the weapon has a range of at least 250 miles and will likely be capable of speeds greater than Mach 5.0. Given its sheer speed, the Zircon will be extremely difficult to intercept with current missile defense technology.