Can you find the key in the picture below?

After undergoing a successful eye operation, A blind girl has just boarded a train to her home. The doctor asked her to open the bandages after 3 hours. On her train journey, she opened the bandages and within a fraction of the time she commits suicide by jumping off the train.

Though her operation was successful, Why did she commit suicide?

Can you make four (4) nines (9) equal 100?

Can you name an animal whose killing cannot be performed without spilling your own blood?

Can anyone tell me a word in the English dictionary which has a silent 'z'?

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

What can you hold in your right hand, but never in your left hand?

Which Travels Faster? Solve below famous picture riddle:

What has a bottom at the top?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?