There was an aeroplane crash, every single person died, but two people survived. How is this possible?

How many Watermelons are there in the below picture?

Replace the question mark with the number below given a simple math problem.

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Which is heavier: a ton of bricks or a ton of feathers?

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

What can you see in the middle of March and April that you can never see in any other month?

What goes through cities and fields, but never moves?