Sam invested $7000, some at 7.2% interest and the rest at 9.2%. How much did he invest at each rate if he received $560.00 in interest in one year? Investment at 7.2% account = $

Investment in 9.2% account = $

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