Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

You can see it everyday, But cannot touch it at will. What is it?

I am the fastest animal but cannot climb the tree. What am I?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

A bomb goes off.
Carnage.
One person, only a few feet away, survives! How can this be?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

You know three triplets: Frank John and Wayne (need to return your money). Frank always tells the truth while John and Wayne always lie. You meet one of them on the road and can ask him a three-word question.
Which question, will you ask?

Replace the 'X' with any mathematical symbol to make the expression equal to 111.

18 X 12 X 2 X 3 = 111

I have lakes with no water, mountains with no stone and cities with no buildings. What am I?

A landlord calls both of his sons and tells them that their horses will now decide who will transfer the inheritance. He tells them to race along the land till the end and the one whose horse will be slower will win and be the heir to all the property.

Both of them keep wandering for days but to no result. Then they ask a wise man regarding it. The man advises them on the matter after which they jump on the horses and race as fast as they can till the end. Why did they do it?

What did the wise man say?