Good Riddles

Question: What can you put in your mouth, but not swallow?

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: You are driving a car.. The car traveled for 25 km and then stopped.. After having lunch he starts the car at exact 3 pm and stops at 5 again.. he travels for only 2 hours every time. Who is the driver?

Question: Without one or the other both would not exist. what i'm I ?