What is the difference between a jeweller and a jailer?

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?

Can you figure out the logic I used to decide the order of the following words:
gun, shoe, spree, door, hive, kicks, heaven, gate, line, den

I have no life, but I can die. What am I?

How many times in a given day, minutes and hour clock comes in a straight line ?

What does an Island and the letter T have in common?

How many triangles are there on the puzzle below?

What begins with T, ends with T, and has T in it?

What does this rebus means ?

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?