Answer:
your dog Callie can travel 210 miles in 10 hours at a speed of 21 miles per hour.
Step-by-step explanation:
If your dog Callie can run at 21 miles per hour (mi/h), you can calculate how far he can travel in 10 hours by using the formula:
Distance = Speed × Time
Distance = 21 mi/h × 10 hours
Distance = 210 miles