Solution:

Simple, the slow ones are in prison :-)

Solution:

He cannot marry his widow's sister in any country. This is because if his wife is a widow, he is already dead.

Solution:

Diwali was celebrated as a mark of Lord Krishna win over the Narakasuna by killing him. Now Krishnavathaar comes after Raamavathaar in the Dasavataar. Therefore, Lord Rama could not have celebrated Diwali.

Solution:

8 is the required number.

Here, by dividing in half, we will actually chop off the digit from the middle. Then you will be left with two zeroes.

Solution:

The pills can run for an hour.

Explanation:
If you had ninety minutes in mind, then you are wrong. You took the first pill at the zero minute. Then you took the second pill after 30 minutes and the third pill after 30 + 30 i.e. 60 minutes or an hour.

Solution:

The Hundred Years war lasted 116 years from 1337 to 1453.

Solution:

If they are standing back to back, then it is possible.

Solution:

November, Their calandar was 13 days behind ours.

Solution:

Align the toothpicks to form TEN. Use one toothpick for each of the lines.

Solution:

Both of them were sitting in the opposite directions of the table with their backs facing each other.