What word is pronounced the same if you take away four of its five letters?

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?

How can you leave a room with two legs and return with six legs?

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

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

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

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

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

Which five letter word can be added at the end of below word to form a
valid word?

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I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?