user: Question: What was the max mach when the maximum speed was 3887?
Columns: ['Pilot', 'Organization', 'Total Flights', 'USAF space flights', 'FAI space flights', 'Max Mach', 'Max speed (mph)', 'Max altitude (miles)']
Types: ['text', 'text', 'real', 'real', 'real', 'text', 'real', 'text']
Sample row: ['Michael J. Adams †', 'U.S. Air Force', 7.0, 1.0, 0.0, '5.59', 3822.0, '50.3']
SQL:

assistant: SELECT "Max Mach" FROM "Table" WHERE "Max speed (mph)" = 3887.0;