Astadium has two sponsorship deals. deal a has revenue of $100,000 and expenses of $10,000. deal b has revenue of $50,000 and expenses of $20,000. what is the stadium's average profit as a percentage of revenue?

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