0.21 to 0.48 km (0.13 to 0.30 miles) per hour
Depends
You cannot crossbreed tortoises. Each species of tortoise has a gut flora peculiar to that species. The gut flora of one species can prove dangerous to another species. Different species of tortoise...
I say they are so because think the got to Cary that shell.
299,792,458 meters per second.