Tramcars and a pedestrian

Algebra Level 4

While walking along a tram line I noticed that a tramcar caught up with me every 12 minutes, and every 4 minutes a tramcar coming in the opposite direction passed me. We were both (tramcar and I) moving at a uniform rate.

What was the time interval between two tram cars leaving their terminals?

Image credit: Flickr Ingy The Wingy
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