# RE1 | openai/gpt-5.6-luna | run 2

## Prompt

A train travels 240 miles in 3 hours, then 180 miles in 2 hours. What is its average speed for the entire trip? Show your work.

## Response

The train’s average speed for the entire trip is **84 miles per hour**.

## Work

Total distance:

\[
240 + 180 = 420 \text{ miles}
\]

Total time:

\[
3 + 2 = 5 \text{ hours}
\]

Average speed:

\[
\frac{\text{total distance}}{\text{total time}}
= \frac{420}{5}
= 84 \text{ mph}
\]

**Answer: \(84\text{ miles per hour}\)**

Would you like to see why averaging \(80\) mph and \(90\) mph directly would give the wrong result?
