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

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

John asked Jack, "The time right now is 7 pm. Can you tell me what will be the time 23, 999, 995 hours later ?"

While Bella does not know the answer, do you ?

What do you see in the image below

No one wants to have it, but if one got it, he does not want to lose it. What is It?

I have an eye but still cannot see.

Who am I?

There is a box. The area of its top is 240 square units, the area of the front is 300 square units and the area of the end is 180 square units.

Can you calculate the dimensions of this box with the given data?

What is the next number in this series?

4,12,84,3612....

What has no start, end, or centre?

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?