Agree with the taxi as the most cost-effective to transport three passengers from LAX to the Bev. Wilshire.

When returning to the airport, if going during commute hours, here is an alternative surface-street routing to give to the cab driver (this will avoid the freeway):

From the BW, south on Beverly to Pico, west on Pico to Overland, south on Overland to Venice (or National), west on Venice to Sepulveda, south on Sepulveda to the airport.