Please help me out here! :)

Find the balance at the end of 4 years if 1000 is deposited at the rate of

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?

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