A FLY A TWO RED BUSES

Two red buses, 200 km apart, are moving toward each other at the speed of 50 km/hour each. A fly takes off from one red bus flying straight toward the other at the speed of 75 km/hour. Having reached the other red bus, the fly bounces off it and flies back to the first red bus. The fly repeats the trip until the trains collide and the bug is squashed.
What distance has the fly traveled until its death?

NB. Think outside the box.              

Puzzle for today - Weighing in a Harder Way

You've got 27 discs, each of them is 10grams, but for 1. The 1 different disc is 9grams or 11grams (heavier, or lighter by 1g). You should use balance scale that compares what's in the two pans. You can get the answer by just comparing groups of discs.

What is the minimum number weighings that can always guarantee to determine the different coin.
Please put your answer in the comment box ,If no correct answers by 12pm,I will supply you with the answer    .GOODLIUCK    

Humans vs Vampires

Three Humans and three Vampires want to get to the other side of a river. There is a small canoe, which can take only two people at a time. To prevent a tragedy, there can never be more Vampires than human beings together, we can have this combinations. 

Clue
Humans  Humans  Humans Vampires Vampires Vampires
 Humans Humans Humans  Vampires Vampires
 Humans Vampires
Humans Humans Vampires

This is is long calculation
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Help solve the Barbershop Puzzle

A traveler arrives in a small town and decides he wants to get a haircut. There are only two barbershops in town - one on East Road and one on Road. The East Road barbershop is a mess, and the barber has the worst haircut the traveler has ever seen. The West Road barbershop is neat and clean, its barber's hair looks as good as a movie star's.

Which barbershop does the traveler go to for his haircut, and why?      Can you put your answers in the comment field
      

Can you solve the She-goat, Wolf and Cabbage puzzle?

A farmer returns from the market, where he bought a she-goat, a Vegetable and a wolf (what a crazy market :-). On the way home he must cross a river. His boat is small and won't fit more than one of his purchases. He cannot leave the she-goat alone with the Vegetable (because the she-goat would eat it), nor he can leave the she-goat alone with the wolf (because the she-goat would be eaten).
How can the farmer get everything on the other side in this river crossing puzzle?