Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

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?

You need to arrange three 7 and mathematical symbols to form number 1?

Find the missing letter in the last circle logically in the given below picture.

Which point will the car reach to go out?

What word begins and ends with an E, but has only one letter?