What time was it 15 minutes earlier? time: 1: 03 and 8: 36

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

How do i start to solve? would appreciate a walk-thru! a bird sitting 16ft above the ground in an apple tree dislodges an apple. after how many seconds does the apple land on the ground? (assuming that no branches will interfere with it's fall)

Can somebody 1. what is the formula for finding the vertical distance between two points on a coordinate plane?