What does this Rebus Picture mean?

What do you think with the below Picture ?

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 is both possible and impossible at the same time?

Can you count the number of triangles in the given picture?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

Identify the hidden meaning behind this picture?

what does the below rebus means?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.