Is multiplying proportional?

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

Evaluate the expression. (9 + 5)(3 + 2)0

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30