Why are all black people so quick ?

In the picture given below, can you find out which digit will take place of the question mark?

What is the word or phrase?

I look at you, you look at me I raise my right, you raise your left. What am I?

The product of three consecutive numbers is 7980.
Then the sum of these consecutive numbers would be?

What word does this rebus represent?

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I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?