If it took eight men ten hours to build a wall, how long would it take four men to build it?

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

Find the next number in the series below

21 32 54 87 131 ?

Which is the correct shadow of the bird?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

A man is found dead in his bathroom naked with blood scattered all around him. The bathroom was locked from the inside and there is no trace of any struggle. There is nothing in the bathroom except his pant with the belt still around and his shirt. Also, the medic team can't find any incision in his body that may have been the reason behind so much blood loss.

The Police department is clueless regarding this murder mystery.
Can you?

What does this rebus means ?

Find the missing number in the sequence below:

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

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?