Can you help me? I am confused this is a hard question for me

This is so hard and it’s for a test

Expresa commuter train leaves downtown sation and travels at a average speed of 55 miles per hour towards the north side sation, which is 50miles away. thirty minutes later, express commuter train #7 leaves north side and travels at a average speed of 35miles per hour towards downtown sation. at the moment the two trains pass each other, how far(in miles) is train #12 from the downtown sation and how long(in minutes) has the #12 train been traveling

Using graph paper, determine the line described by the given point and slope. click to show the correct graph below.(0, 0) and 2/3