Come on smart heads . earn you some points with this easy problem . i know you can do it !

Which one ? is the answer and how to find this 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 solution to the equation below? 3/x-2+6=square root x-2 +8