Could someone help me? −6⋅f(3)−6⋅g(−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

Aline that intersects one of two parallel lines intersects the other also always sometimes never

What is the value of x? enter your answer in the box. x =