A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

Find the next number in the series below

21 32 54 87 131 ?

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

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

The centre of the third figure is empty. What digit should fit inside?

Which tank will fill first?