What does the below image rebus riddle means ?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

I’m tall when I’m young, and I’m short when I’m old. What am I?

Can you move 2 matchsticks to form four equal sized squares.

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

What can go through glass without breaking it?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

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

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

If your uncle’s sister is not your aunt, what relation is she to you?