table: 1-11318462-5
columns: Crew, Open 1st VIII, Open 2nd VIII, Open 3rd VIII, U16 1st VIII, U16 2nd VIII, U16 3rd VIII, U15 1st IV, U15 2nd IV, U15 3rd IV, U15 4th IV, U15 5th IV, U15 6th IV
Q: how many open 2nd viii had u15 3rd iv being gt
A: SELECT COUNT Open 2nd VIII FROM 1-11318462-5 WHERE U15 3rd IV = 'GT'