ACT math scores are approximately normally distributed, with a mean of 21 and a standard deviation of 5.4. If Eli decides to take the ACT exam, what would he need to score in order to be in the 85th percentile?

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