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We have fairly good estimates of these things.
The B 58 bombers in the American Air Force have a supersonic performance, but only a few of these are in service as yet. There are also in service a few Russian supersonic bombers, as was shown at the Russian Air Display last year. Both the Vulcan, and the Victor, and, indeed, the Valiant, are superior in speed performance to the great bulk of the bombers of other countries.