Akio cut a piece of plywood into a square the perimeter of the plywood was 78.4 inches what was the length of each side

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

Pls the last one and it has to be like number 6

Segment wx is shown explain how you would construct a perpendicular bisector of wx using a compass and a straightedge