Brain Teasers!

Mr Doc gave you 3 pills and says to take one every 30 mins, how long till all pills are gone?

what goes up and down but remains in the same place?

Larry's father has three sons named Snap, crackle and... What is the third son's name?

What travels around the world but always stays in a corner?

There was an airplane crash, every single person died yet two survived. How is this possible?

What can you lead up the stairs but not down?

Some months have 31 days, some have 30 days. how many months have 28 days?

If it took 8 men ten hours to build a wall, how long would it take 4 men to built it?

How many cubic metres of dirt is there in a hole 3 m deep, 2m long and 1m wide?