CREATE TABLE table_66849 ("Vehicle Flight #" TEXT, "Date" TEXT, "Pilot" TEXT, "Mach" FLOAT, "Velocity  ( km/h ) " FLOAT, "Altitude  ( ft ) " FLOAT, "Duration" TEXT)

What is the lowest altitude of the flight with a mach bigger than 0.905 and a duration of 00:06:17?
SELECT MIN("Altitude (ft)") FROM table_66849 WHERE "Mach" > '0.905' AND "Duration" = '00:06:17'
SELECT MIN("Altitude (ft)") FROM "table_66849" WHERE "Duration" = '00:06:17' AND "Mach" > '0.905'