Help i dont have much time

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

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

Aquadratic equation in standard from is written ax^2= bx+c, where a, b and c are real numbers and a is not zero?