LINEAR RELATIONSHIPS MATH, PLEASE HELP

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

Fill in the table with whole numbers to make 430 in five different ways

Geometry - finding area of regular polygons and sectors (check my math, i can’t find the error)