I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

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?

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

Can you find out which number multiplied by itself will give the output as 12345678987654321?

Three fair coins are tossed in the air and they land with heads up. Can you calculate the chances that when they are tossed again, two coins will again land with heads up?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

what does the below rebus means?

A person was found dead on a big green land with no trees or buildings around. When the police arrived, they found a piece of rock lying next to him and the man was wearing clothes comprising of red, blue and yellow colours.

Can you tell who the person is and what was the cause of death?

Prove that the below maths equation is true.

8 + 8 = 91

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So i can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits