What is the coolest letter in the alphabet?

Replace the question mark in the picture below.

Replace the question mark with the correct number in below Picture:

Can you fill the blank with the correct number?

6 30 870 756030 _____

In the picture given below, can you find out which digit will take place of the question mark?

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?

P is the father of Q and S is the son of R. T is the brother of P and has a daughter U. If R is the sister of P, then what is the relation between U, Q and S?

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?

If two's company, and three's a crowd, then whats four and five ?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E