CREATE TABLE table_13643320_2 (rnd VARCHAR2, gtp_winning_team VARCHAR2, gto_winning_team VARCHAR2)

What us the number of the round during which #56 Blue Thunder Racing become the GTP winning team and #38 Mandeville Auto Tech became the GTO winning team?
SELECT rnd FROM table_13643320_2 WHERE gtp_winning_team = "#56 Blue Thunder Racing" AND gto_winning_team = "#38 Mandeville Auto Tech"
SELECT "rnd" FROM "table_13643320_2" WHERE "#38 Mandeville Auto Tech" = "gto_winning_team" AND "#56 Blue Thunder Racing" = "gtp_winning_team"