What is at the end of a rainbow?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Let's play a word game. Following are some meaningless words that can be completed by adding random letters on either side of the word.

For example, the word "rdo" can be formed into "pardon".

Using the same technique, can you complete the given words?
ecalc
airb
rinci
tibac
uidel
gorit
igna
eyho

What English word has three consecutive double letters?

f you were running a race, and you passed the person in 2nd place, what place would you be in now?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

A patient was diagnosed with some ailment. He was given five different tablets to take at night at an interval of 15 minutes.

How long will it take the patient to consume all the five tablets?

Two fathers and two sons went fishing one day. They were there the whole day and only caught 3 fish. One father said, that is enough for all of us, we will have one each. How can this be possible?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?