Good Riddles

Question: What makes a hotel hot even when below zero temperatures?

Question: When Tommy was 10 years old his sister Suzy was half his age. Now that Tommy is 50 years old how old is his sister Suzy?

Question: Does a ton of feathers or a ton of bricks weigh more?

Question: I have Eighty-eight keys but cannot open a single door?

What am I?

Question: I have two arms, but fingers I have none. I've got two feet, but I cannot run. I carry well, but I carry best with my feet off the ground. What am I?