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?

The centre of the third figure is empty. What digit should fit inside?

Which Travels Faster? Solve below famous picture riddle:

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?

Name a key which is hardest to turn.

Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

Spot the cat in the picture below

Spelt forwards I’m what you do every day, spelled backwards I’m something you hate. What am I?

The day after tomorrow will be three days before Tuesday. Can you find out what is today?