Name one eight-letter word with 'kst' in the middle, 'in' the beginning, 'and' at the end.?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

If you're 8 feet away from a door and with each move you advance half the distance to the door. How many moves will it take to reach the door?

Replace the question mark with the correct number below.

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

0 0 0 = 6
1 1 1 = 6
2 2 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

You can use any mathematical symbols in the space provided to make all above algebraic expressions true.

A man always keeps a spare tyre in his car. To make full use of all the five tyres, he changes the tyres in a manner that for a distance of 1, 00,000 km, each of them runs the same distance.

Can you calculate the distance travelled by each tyre on that journey?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see? What is it?

Find the next number in the series below

21 32 54 87 131 ?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?