What does this rebus mean?

O
N
C
E
TIME

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island. What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

Who can jump higher than a Mountain?

An evil man kidnapped someone and made them take one of two pills. One was harmless, but the other was poisonous. Whichever pill the victim took, the kidnapper took the other one. The victim took their pill with water and died. The kidnapper survived. How did the kidnapper get the harmless pill?

Two Twins Jack and Jill were standing back to back and suddenly they started running in opposite direction for 4 kilometres and then turn to left and run for another 3 kilometres.

what is the distance between the Baggio twins when they stop ?

I am a mother. However, I never give birth.

I am a father. However, I never nurse my children.

Wandering is not possible for me, but standing still happens occurs rarely.

Who am I?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

Which city is three-fifths chick two third cat and 50% goat?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?