Which expression is equivalent to the following complex fraction? (2-1/y)/(3+1/y)

a. (3y+1)/(2y-1)
b. (2y-1)(3y+1)/y^2
c. y^2/(2y-1)(3y+1)
d. (2y-1)(3y+1)

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