Hard riddles to test your mental acuity

Plane crashed between border of France and Belgium-Hard Riddle

A plane crashed between the border of France and Belgium. Where were the survivors buried?

Answer: They weren't. Survivors don't need to be buried.

What runs, but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?

Poor people have it. Rich people need it. If you eat it you die. What is it?

Sara has four daughters, and each of her daughters has a brother. How many children does Sara have?

Answer: Five each daughter has the same brother.

What five-letter word becomes shorter when you add two letters to it?

Answer: Short (add two letter  e and r it becomes "Shorter")

If your uncle's sister is not your aunt, what relation is she to you?

What spends all the time on the floor but never gets dirty?

Two fathers and two sons are in a car, yet there are only three people in the car. How?

Answer: They are grandfather, father, and son

The 22nd and 24th presidents of the United States of America had the same parents but were not brothers. How can this be possible?

Answer: They were the same man, Grover Cleveland

Take away the whole, and some remain. What is it?

How many bananas can you eat if your stomach is empty?

Answer: Just one—after that, your stomach's not empty anymore.

Voiceless it cries, wingless flutters, toothless bites, mouthless mutters.

 Jared's father has three sons, Snap, Crackle and?

How much dirt is in a hole that's two feet by three feet?

What begins with an "e" and only contains one letter?