Is the statement valid that it does not matter how much older a sibling is, eventually the younger one will be half as old as the older one?

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

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

The Federal bank of London is abducted by the robbers. The head of the robbers asked the cashier to empty their money vault to them and when suddenly cashier got a call from her father. To avoid any suspicion, the robber asked the cashier to pick the call and reply her father in the shortest manner possible.

The cashier told her father "Is there an emergency father, Call me when you are free and I will help you in your furnishing" and then the cashier hung up the phone.

After 10 minutes, police arrived at the crime scene.

How did the police know about the robbery?

In a boat, the father of a sailor's son is sitting with the son of the sailor. However, the sailor is not present on the boat.

Can this even be possible?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

A woman lives in a Tall building thirty-six floors high and served by several elevators which stop at each floor going up and down. Each morning she leaves her apartment and goes to one of the elevators. Whichever one she takes is three times more likely to be going up than down. Why?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Can you spot the hidden girl in the picture below?