25 Horses

You have to organize a racing event to find out top 3 horses. You have a 5 lane track and you DO NOT have stop watch.

Find out the minimum number of races in which you can find the winners.
-> Seven races
Best answer was given by Mandeep Singh (8) and then by Amritpal Singh (10)

Move Coins

Just tell me how long you took to solve this :)

Find roof’s height

You entered in room and noticed that there is nothing but a bulb hanging from the ceiling. You noticed that the bulb is exactly touching your head and it is in the center of roof (where diagonals meet.)

So, what is roof’s height? BTW, you just came from office. So, go ahead and take some assumptions

Solution: -
The only assumption I will take is "I have a watch" & actually I do :) Now, given that bulb is hanging from the ceiling, I can make it swing like a "Pendulum". Then I can find out the length of the string T = 3.14 SQRT (L/32) . Finally, I will add 5'10 to L and that the roof's height :)

So, do you want more puzzles ??

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