Question: What is the fastest lap for Seiji Ara?
SQL: SELECT "Fastest Lap" FROM "2-16670746-2" WHERE "Winning Driver" = 'Seiji Ara';

Question: On what date does Yuji Tachikawa have the fastest lap in round 1?
SQL: SELECT "Date" FROM "2-16670746-2" WHERE "Fastest Lap" = 'Yuji Tachikawa' AND "Round" = 1.0;