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Vandaag is het 21 October 2018

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# Rolling from a slope - science puzzle

Difficulty:

Rating: 2.8/5.0

At the same time a block of iron and an equally heavy iron sphere are released from the top of a slope. Assume that the friction between the slope has a negligible effect on the velocity of the block and the sphere. Which of the two will be down first?

# Marching men - math puzzle

Difficulty:

Rating: 2.7/5.0

A long and straight row of soldiers is marching with constant speed. The dog of the commander runs along the row from the end till the beginning, from the beginning till the end, from the end till the beginning etc. This takes always 2 minutes, 1 minute, 2 minutes, etc.
At some point the soldiers have to pass a very small bridge. However, the commander does not trust the strength bridge completely. He wonders how much time it will take them to pass the bridge when they stay marching with the same speed. How much time is that?

# The swamp - math puzzle

Difficulty:

Rating: 3.0/5.0