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

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

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 will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

What does the below image rebus riddle means ?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

Client Dempsey living in one of the East Coast states of the U.S. was talking to Landon Donovan, who was living in the West Coast state of the U.S.

Dempsey: What time is it?
Donovan: Wow, It is the same time here.

How is this possible?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

What does this rebus means ?

PROG WORKRESS