A car dealership is promoting a particular model of car that has 8 optional features available. Each optional feature can be purchased separately. How many different packages of 3 optional features are possible for this model of the car?
options:
72
336
56
24

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