Good Riddles

Question: If it takes three men two days to dig a hole, how long does it take one man to dig half of a hole?

Question: There are two ropes that both take exactly 1 hour to burn from end to end. You are unable to cut the rope. How can you burn the two ropes in a total of 45 minutes?

Question: What English word is as long as it is valued?

Question: how do cows count?

Question: A wise man once called me "the moist star", and in an infinite sea, I can be seen afar. I create motions in which you may ride on for sport, and am also used as a scientist's port. What am I?