# RE1 | openai/gpt-5.4-mini | run 1

## 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 average speed for the whole trip is **84 miles per hour**. Compute it by dividing the total distance by the total time.

## Work

- First part: \(240\) miles in \(3\) hours
- Second part: \(180\) miles in \(2\) hours

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

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

### Average speed
\[
\frac{420}{5} = 84 \text{ miles per hour}
\]

**Answer: 84 mph**

Would you like a quick rule for average speed problems like this?
