I'm leaving on a Caltrain

Algebra Level 3

Calvin is riding a train from San Francisco to Los Angeles. During his ride, he sees a train coming from Los Angeles passing every 20 minutes. Assuming that all trains run at equal speeds (in both directions), and depart at fixed regular intervals, how many trains arrive in San Francisco in 8 hours?

Details and assumptions

You may use the fact that there are 60 minutes in an hour.

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