Color of Hunted Animal

A man went for hunting. He started from his home and went 10kms South, were he didn't find any animals. So went 10kms East found an animal and he hunted it. Then he went 10Kms North and reached his home.
Find the color of the animal he hunted.

Defective Coin

There are nine gold coins of same weight, in that one of the coin is defective (means either it is more weight or less weight than others).

you have to find the defective gold coin among nine coins, A physical balance is given to you, and you have to use the balance only three time. How will you find the defective coin?

LEAK TANK

A tap can  fill a Tank completely in 2 hours, But because of the Leak in the Tank, the tap took 2 hrs and 30 mins.
If the Tank was full, How long  would it take to drain the tank through the LEAK?