Adeveloper owns 54 acres of land. if he plans to use 3.2 acres of land for an entrance into a housing development and divides the remaining land into 1.2 acre lots, how many lots will he have?

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