Buy me, smell me or deliver me, I do not change.

Who am I?

What time is it when an elephant sits on a fence?

How many Watermelons are there in the below picture?

ENEMY = 2 * LINK
LINK + 2 = HELL

Then what will be TAXI + HELL? Select from the options below:
a) ROTTEN
b) DANGER
c) HEAVEN
4) MORTAL

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

What has one letter and starts with an E?

In order to complete the racing competition, the Mexico racetrack has to submit its top and the most famous three horses to win the competition. Due to an electrical storm, all the records are cleared and no one knows which horse holds the record. They all look identical and it becomes even more difficult to differentiate the horses. There are 25 horses in the Mexico racetrack. But there can be only five horses at a time on the track. What will the least number of races that can be conducted to find out the three fastest horses?

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?

I add 5 to 9 and get 2. The answer is correct, so what am I?

They came out at night, without being called.
They lost at day, without being stolen.
Who are they?