What is the new price of the plane ticket

How do i get the answer for 2/3 * 10/3

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 spreadsheet would be used to compute the first nine terms of the geometric sequence a^n=32•(1/2)n-1