How many times do a clock's hands overlap in a day ?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

I left my campsite and hiked south for 3 miles. Then I turned east and hiked for 3 miles. I then turned north and hiked for 3 miles, at which time I came upon a bear inside my tent eating my food! What colour was the bear?

Can you fill the blank with the correct number?

6 30 870 756030 _____

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

A man is found hanging dead from the ceiling of a room. The room’s dimensions are 15 x 15 x 15. The man is only 6ft tall and the rope was only 2ft long. There are no windows and only one door to the room. The door is bolted shut from the inside, and a puddle of water is under the man. How did he kill himself?

There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?