CREATE TABLE table_45511 ("Position" FLOAT, "Pilot" TEXT, "Glider" TEXT, "Speed" TEXT, "Distance" TEXT)

What was sebastian kawa's average speed with Diana 2?
SELECT "Speed" FROM table_45511 WHERE "Glider" = 'diana 2' AND "Pilot" = 'sebastian kawa'
SELECT "Speed" FROM "table_45511" WHERE "Glider" = 'diana 2' AND "Pilot" = 'sebastian kawa'