Help please with this answer?

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

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

What is the point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)