CREATE TABLE table_1817879_2 (length__miles_ VARCHAR, endpoints VARCHAR)

What is the length (miles) when pico to 7th st/metro center are the endpoints?
SELECT length__miles_ FROM table_1817879_2 WHERE endpoints = "Pico to 7th St/Metro Center"
SELECT "length__miles_" FROM "table_1817879_2" WHERE "Pico to 7th St/Metro Center" = "endpoints"