Why is a river so rich ?

O_er_t_o_

Complete the missing letters of the given word.

How can you make number one disappear by adding something to it?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

How many times in a given day, minutes and hour clock comes in a straight line ?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

Birbal was jester, counsellor, and fool to the great Moghul emperor, Akbar.
The villagers loved to talk of Birbal's wisdom and cleverness,
and the emperor loved to try to outsmart him.
One day Akbar (emperor) drew a line across the floor.
"Birbal," he ordered, "you must make this line shorter, but you cannot erase any bit of it."
Everyone present thought the emperor had finally outsmarted Birbal.
It was clearly an impossible task.
Yet within moments the emperor and everyone else present had to agree that Birbal had made the line shorter without erasing any of it.
How could this be?

If you’ve got me, you want to share me; if you share me, you haven’t kept me. What am I?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

A train full of passengers goes through a tunnel. When the train comes out from the other end, there is no single person on the train.

How did it happen?