Which number should replace the question mark?

There is a barrel with no lid and some wine in it. 'This barrel of wine is more than half full,' said Curly. 'No it's not,' says Mo. 'It's less than half full.' Without any measuring implements and without removing any wine from the barrel, how can they easily determine who is correct?

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?

John drives to his office at 20km/hr. After reaching the office, he realizes that today is a holiday. He went back at an average speed of 30km/hr. Discounting the time spent in the stoppage what was the average speed of his journey?

I don't get anymore wetter, no matter how much rain falls on me.

Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

John was driving a bus and got stuck when passing through an underpass. Then came Jacob with a needle and got the bus out of the underpass.

What did the boy do?

Rahul decided to meet Simran so he boards a local train from Bombay station. Just after the station, there is a 1km long tunnel. The train starts and is now accelerating. Rahul is a claustrophobic guy, so what is the best position for him to sit?

Which city is three-fifths chick two third cat and 50% goat?

You need to arrange three 7 and mathematical symbols to form number 1?