Recent surveys indicate 60% of tourists to china visited the forbidden city, the temple of heaven, the great wall, and other historical sites in or near beijing. forty percent visited xi’an with its magnificent terra-cotta soldiers, horses, and chariots, which lay buried for over 2,000 years. thirty percent of the tourists went to both beijing and xi’an. what is the probability that a tourist visited at least one of these places? (

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