Answer: In 1 hour, 12720 more times rabbit's heart beat than a dog's rabbits heart beat
Explanation:
Since we have given that
Rabbit's heart beat in 1 min 212 times more than dog's heart beat in 1 min.
So, in 1 hour , we get,

So, in 1 hour, 12720 more times rabbit's heart beat than a dog's rabbits heart beat .