user: Question: What Time elapsed has both the Launched of 15 October 1997 and the Closest approach of 24 June 1999?
Columns: ['Spacecraft', 'Destination', 'Launched', 'Closest approach', 'Time elapsed']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Ulysses', 'Jupiter', '6 October 1990', '8 February 1992', '491 days (1 yr, 4 mo, 3 d)']
SQL:

assistant: SELECT "Time elapsed" FROM "Table" WHERE "Launched" = '15 October 1997' AND "Closest approach" = '24 June 1999';