Express commuter train #12 leaves the downtown station and travels at an average speed of miles per hour towards the north-side station, which is miles away. Express commuter train #7 leaves the north-side station 15 minutes later and travels at an average speed of miles per hour towards the downtown station.
At the moment when the two trains pass each other, how far (in miles) is the #12 train from the downtown station and how long (in minutes) has the #12 train have been traveling?