Solve
-An Express and Local Train Leave GraysLake at 3 $= 50 \mathrm { mph }$

question 8

Multiple Choice

Solve.
-An express and local train leave GraysLake at 3 P.M. and head for Chicago 50 miles away. The express travels twice as fast as the local and arrives 1 hour ahead of the local. Find the speed of each train.

• A) Express's rate \(= 50 \mathrm { mph }\) and local's rate \(= 25 \mathrm { mph }\).
• B) Express's rate \(= 25 \mathrm { mph }\) and local's rate \(= 12.5 \mathrm { mph }\).
• C) Express's rate \(= 60 \mathrm { mph }\) and local's rate \(= 30 \mathrm { mph }\).
• D) Cannot be determined with information given.

---

Definitions:

Indicator Variables

Variables used in statistical models that take the value 1 if a certain condition is met and 0 otherwise, often used for representing categorical data.

Seasonal Variations

Periodic fluctuations in time series data that occur at regular intervals due to seasonal factors.

Stock Market Performance

An indicator of the overall health and activity of the stock market, often reflected through indexes like the Dow Jones or S&P 500.

Cyclical Variation

A pattern in time series data that occurs over longer periods and is often related to economic or business cycles.