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

Complete the table series riddle by finding the number that can replace "??".

Forwards I am heavy, backward I am not. What am I?

Our product and our sum always give the same answer. Who are we?

If we tie a Sheep to one peg, a circled grass is been eaten by the Sheep. If we tie the Sheep to two pegs with a circle on its neck, then an eclipse is eaten out of the grass by the Sheep. If we want an eclipse then we put two pegs and then put a rope in between them and the other end of the rope is tied up on the Sheep's neck.

How should we tie the peg and the Sheep so that a square is eaten out from the garden grass? We only have one Sheep rope and the peg and the rings.

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

81 x 9 = 801. What must you do to make the this equation true?

What is the word or phrase?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

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