Cheryl mixed 32 cups of either orange juice and pineapple juice using a ratio of 3 cups of orange juice to 5 cups of pineapple juice. how many cups of pineapple juice did she use?

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