Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

In the given picture, in how many ways can you read the word "Tiger"?

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

What has 88 keys?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

What is red and smells like blue paint?

Three cars are driving on a track that forms a perfect circle and is wide enough that multiple cars can pass anytime. The car that is leading in the race right now is driving at 55 MPH and the car that is trailing at the last is going at 45 MPH. The car that is in the middle is somewhere between these two speeds.
Right now, you can assume that there is a distance of x miles between the leading car and the middle car and x miles between the middle car and the last car and also, x is not equal to 0 or 1.
The cars maintain their speed till the leading car catches up with the last car and then every car stops. In this scenario, do you think of any point when the distance between any two pairs will again be x miles i.e. the pairs will be x distance apart at the same time ?