Can you calculate the probability of getting a sum of six when a dice is thrown twice?

What does the below rebus riddle means?

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?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

A man dies of old age on his 25 birthday. How is this possible?

A new Engineering building containing 100 offices had just been completed. John was hired to paint the numbers 1 to 100 on the doors. How many times will John have to paint the number nine (9)?

Give it food and it will live; give it water and it will die.

How far can you walk into the woods?

Three friends named Mr. Black, Mr. Yellow and Mr. Green enter a pub on a weekend night. They are wearing either a Black, Yellow or Green shirt.

Mr. Yellow says to them, 'Did you notice that we all are wearing different color shirts than our names?'

To this, the man who was wearing the Green shirt said. 'Wow, thats right.'

Can you identify who is wearing which colour shirt ?

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?