The Renaissance Man

Dr. Johnnie Williams III BA, MS, DD

Brain Teaser Returns – Are you ready to get you brains teased?

The Train Cars and the Bridge Crossing

A train comes to a bridge that can carry a maximum weight limit of 12 tons. The engine of the train weighs 1 ton, and the four cars that the train is hauling weigh 11 tons, 7 tons, 5 tons, and 2 tons. The heavier the load the slower the train is able to travel. It takes the engine one minute to cross he bridge for every ton of weight that it is pulling, including itself. ( For example, if the one ton engine were hauling an 8 ton car, it would take 9 minutes to cross the bridge.) What is the least amount of time required for the entire tain to cross the bridge? Assume that it doesn’t take any time to hook and unhook the cars at both ends and that there is a switching station at both ends to move the cars around in any order.

I will post the solution to this riddle on Wednesday August, 25, 2010. Good Luck!!

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August 23, 2010 - Posted by | Brain Teasers, Family, Games, Informational, Puzzles, Riddles, Updates | , , , , , , , , , , , , , ,


  1. people are stupid

    Comment by david michel | August 23, 2010 | Reply

    • I try not to believe that it’s stupidity. It’s more like laziness. No one really reads anything anymore. This is a pretty simple logic puzzle and I’m hoping that there are still alot of folks who want to keep thier minds sharp. I hope you tried to solve this riddle.

      Comment by jw39 | August 25, 2010 | Reply

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