Eighteen is equal to the product of a number (n) and 9

Because of your favorite lemonade it is $3.84 for 3 gallons. write this as an unit rate

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

Rounded to the nearest tenth, what is the value of x