What always comes into a house through the keyhole?

I have Rs.50 and I spend it in the way as below.

When you stop to look, you can always see me. But if you try to touch me, you can never feel me. Although you walk towards me, I remain the same distance from you. What am I?

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

Next Number in the Series,

5, 16, 49, 104, ?

I was speeding and ran through a stop sign, yet two traffic officers who were there do nothing about it.

why?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

What occurs twice in a week, once in a year but never in a day?

Five thieves looted a bank and they ran away in a car. The bank staff informed the police and they began the search of their car in their jeep. They found them on a road and chased them eventually catching them. The light that is used to fill the number plate was broken on the thieves' car. Also, the headlights of the jeep police were not working. How were the police able to catch the thieves then?