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 Weight Limited Bridge (Posted on 2016-08-01)
A driver needs to take his truck across a mile long bridge with a 5,000kg weight limit. This bridge happens to be one of those logic puzzle bridges which will collapse as soon as any weight over the limit is on the bridge.

The driver pulls the truck onto a conveniently placed weigh station right in front of the bridge. It reports the total weight of the truck, including the driver and everything contained in the truck, is 4,999.99kg.

The driver starts to head across. When he reaches the half-way point a sparrow flies overhead looking to land on the truck. The sparrow weighs 30g. What does the driver need to do to avoid the sparrow tipping the weight of the truck past the 5000kg weight limit?

 No Solution Yet Submitted by Brian Smith No Rating

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 re: answer - spoiler | Comment 2 of 6 |

Don't agree.  If the sparrow lands on the truck, the bridge's weight limit is exceeded.

The classical answer to this old chestnut is to let some air out of the tires.  If the truck has n tires, let 30/n grams of air out of each.  (This also works if we need another inch of clearance under some overhang)

 Posted by Steve Herman on 2016-08-01 19:28:46

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