What is the product? 6(x^2-1)*6x-1/6(x+1) 6(x – 1)2 6(x2 – 1) (x + 1)(6x – 1) (x – 1)(6x – 1)

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