Please help me find the correct answer.

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

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

Binh says the point of intersections is (0,-3) which statements identify the errors binh made , check all that apply