How to get right answer?

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.

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

Which statement best explains why ben uses the width hi to create the arc at j from point k