Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_13643320_2 (rnd VARCHAR, gtp_winning_team VARCHAR, gto_winning_team VARCHAR)
### Question:
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? 
### Answer:
SELECT rnd FROM table_13643320_2 WHERE gtp_winning_team = "#56 Blue Thunder Racing" AND gto_winning_team = "#38 Mandeville Auto Tech"