What is the longest word in the dictionary?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

Can you solve the below algebraic mathematical equation?

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

Luis Garavito killed Density x Volume.

Who is Luis Garavito ?

I am white when I am dirty, and black when I am clean. What am I?

There was a competition where the contestants had to hold something. At the end of the event, the winner was a person who had no hands or feet. What was it that the contestants had to hold?

On a windy rainy night , I was driving in my car.
When i reach the bus stand , i see three people waiting for the bus.

1. An old lady who needs an immediate medical attention
2. My Best Friend
3. Girl whom i love from childhood

My car is a two seat, so can you tell me , what i have done in this situation ?

What kind of band never plays music?

What happened when the wheel was invented?

In the four images below, can you find the odd one out?