What is the 1 million dollar math problem?

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

Which image (a’ b’ c’ d’) of abcd cannot he produced using only reflections ?

4. a single woman uses an online cash flow calculator which reveals a cash flow of 203. what does this mean?