Answer
$$1 \times 10^{5} \frac{km}{h}$$
Work Step by Step
Average speed is the distance divided by the time.
$$1 \times 10^{9} \frac{km}{yr} \frac{1 year}{365.25 days} \frac{1 day}{24 h}= 1 \times 10^{5} \frac{km}{h}$$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.