I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

Sachin bought a car with a strange 5 digit numbered plate.The water image of the number is 78633 more than my car number. All the digits of car number are distinct.

What is the original number on number plate?

Name a key which is hardest to turn.

What has many teeth, but cannot bite?

15 caves are arranged in a circle at the temple of doom. One of these caves has the treasure of gems and wealth. Each day the treasure keepers can move the treasure to an adjacent cave or can keep it in the same cave. Every day two treasure seekers visit the place and have enough time to enter any two caves of their choice.

How do the treasure seekers ensure that they find the treasure in the minimum number of possible days?

Count the number of lines in the image below ?

What is the next number in this matchsticks series riddle?

What number divided by 4 is the same as that number minus 4?

You can hear me, but you can't touch or see me.

What am I?

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?