# RE1 | deepseek/deepseek-v4-pro | 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 train covers a total of **420 miles** over **5 hours**, giving an average speed of **84 mph**.

### Step-by-step calculation

Total distance:
\[
240 \text{ mi} + 180 \text{ mi} = 420 \text{ mi}
\]

Total time:
\[
3 \text{ h} + 2 \text{ h} = 5 \text{ h}
\]

Average speed:
\[
\frac{420 \text{ mi}}{5 \text{ h}} = 84 \text{ mph}
\]

Would you like to see how the average speed changes if the train took a 30-minute rest stop between the two legs?
