Saturday, June 9, 2007

Puzzle_20

India Level Contest

Winner of Puzzle _18 is

1. Kulal (Aditi Software)
2. (Aditi tech.)
3. Vikram (Bangalore)
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Puzzle: There are three bulbs in a flat. The main door is made of translucent glass which can allow light to pass through but one cannot find out from which bulb unless he is inside.There are 3 swithes outside and the task is to map the switches to the bulbs goin inside only once.

Note: You can not leave the door open.
Switch on the bulbs and find out the mapping between bulbs and switches.

Solution: Switch on 1 bulb for some time (20 mins). and then switch it off.
Switch on the other bulb. Keep the third bulb off.
Then go to the room.
The bulb which is hot corresponds to the 1st switch,
The bulb which is on corresponds to 2nd switch and
The bulb which is off corresponds to the 3rd switch.


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All the Best

Friday, June 1, 2007

Puzzle_19

India Level Contest

Winner of Puzzle _18 is

Sathish Kulal (Aditi Software)

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Puzzle: Two trains enter in a tunnel 200 Km long, travelling at 100 Km/h at the same time from opposite directions. as soon
as they enter the tunnel a supersonic bee flying at 1000 Km/h starts from one train and heads toward the other one. as soon
as it reaches the other one it turns around and heads back toward the first, going back and forth between the trains until
the trains collide in a fiery explosion in the middle of the tunnel (the bee survives). how far did the bee travel?


Solution: Train Collide in the middle of tunnel.
Each train travel 100 Km before collision.
Each train travelling at a speed of 100 Km/h that means it takes 1 hour to collide.
Speed of supersonic bee is 1000 Km/h
So bee travel 1000 km before collision.

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