Two trains are on the same railroad track; one is headed east the other west, they both leave the station at 1:00 and are travelling at the same speed. Yet they didn't crash into each other. How can this be?
They went at the same time but one went at 1:00 in the afternoon and one went at 1:00 in the morning.
I have four wings, but cannot fly,
I never laugh and never cry;
On the same spot I'm always found,
toiling away with little sound.
What am I?