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

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

You can see three almost identical images below. Can you spot the odd one out from them?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

It is a six-letter word.
The first four letters are me.
The second and last letters are the same.
The fourth second and last letter is payment.

Who is it?

The answer I give is yes, but what I mean is no. What was the question?

What is the coolest letter in the alphabet?

At a party, there are five people and a whole round cake lying at the centre of the table. Only four people will make a cut and take their piece and the last one will get the remaining piece on the table. How can they make sure that everyone gets a 1/5th of the piece?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?