Urgent me! i need this done and dont know how to do it

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

Ametal rod is 2/5 meters long. it will be cut into pieces that are each 1/30 meters long. how many pieces will be made from the rod?

Two airplanes start at the same place and travel in opposite directions,one at 395 miles per hour and the other at 422 miles per hour. how many hours will it take for the planes to be 2451 miles apart?