The probability of drawing an ace from a deck of cards is 1/13. if you drew one card at a time (and put the card back each time) for 400 tries, how many times total could you expect to draw an ace

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