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

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

Buy me, smell me or deliver me, I do not change.

Who am I?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

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?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

I ask Joseph to pick any 5 cards out of a deck with no Jokers.

He can inspect then shuffle the deck before picking any five cards. He picks out 5 cards then hands them to me (Jack can't see any of this). I look at the cards and I pick 1 card out and give it back to Joseph. I then arrange the other four cards in a special way, and give those 4 cards all face down, and in a neat pile, to Jack.

Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?

The solution uses pure logic, not sleight of hand. All Jack needs to know is the order of the cards and what is on their face, nothing more.

Why Wine Glass Stem is so long?