what's the probability of getting a king or a queen from a pack of 52 cards?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

Count the squares in the matchstick puzzle below?

Eight of us go fourth, not back, to protect our king from an attack. What are we?

Why blonde cannot dial 911?

What runs around the whole yard without moving?

Something Extraordinary happened on May 6th 19778 at 12:34am what was that?

Accidentally, two trains are running in the opposite direction and enter a tunnel that is 200 miles long. A supersonic bird that has fled the lab and taken shelter in the tunnel starts flying from one train towards the other at a speed of 1000 mph. As soon as it reaches the second train, he starts flying back to avoid collision and meets the first train again at the other end. The bird keeps flying to and fro till the trains collide with each other.

What is the total distance that the supersonic bird has traveled till the trains collided?