We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

What has to be broken before you can use it?

A convention is held where all the big logicians are summoned. The master places a band on everyone's forehead. Now all of them can see others bands but can't see his own. Then they are told that there are different colours of bands. All the logicians sit in circle and they are further explained that a bell will ring at regular intervals. The moment when a logician knew the colour of band on his forehead, he will leave at the next bell. If anyone leaves at the wrong bell, he will be disqualified.

The master assures the logicians that the puzzle will not be impossible for anyone of them. How will the logicians manage ?

Make a sentence consisting of three words that have the whole alphabet.

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Using Only Five 5's and any mathematical operator make sum as 37

How can you drop a raw egg from a height onto a concrete floor without cracking it?

When is the top of a mountain similar to a savings account?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?