Table: race_results_31
Columns: year
start
qual
rank
finish
laps

Question: What is the number of finish of the Qual of 159.384?
SQL: SELECT "finish" FROM race_results_31 WHERE "qual" = '159.384'

Question: What is the qual for rank 18 in 1964?
SQL: SELECT "qual" FROM race_results_31 WHERE "rank" = '18' AND "year" = '1964'