Can u guys pls help me on this question and pls explain how u got the answer

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

What is the equation of a line that passes through points (0, 4) and (-4,-8)?

Carlos by 24 mi and ran 6 miles what is the ratio of the distance carlos ran to the distance he biked