(I’ll give to the first answer) Find AC

A- 8
B- 30
C- 60
D- 120

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

Solve 3x-18=2y and 5x-6y=6 by elimination show work

X+ y = 5 ; x - y =3 solve using linear combination