Riddles

I decided to do riddles today . I hope you will like them.

                   1.An electric train is riding 47 miles per hour and there is a 20 mile wind .Which way is the smoke blowing.

                    2.It is once in a millisecond, twice in a moment and never in a thousand years .

                    

                    3. I am long when i am young and short when i am old.

                    Answers:

1.It is an electric train.2. M 3.A pencil or a candle