Cool Math/Logic Problem
Gotta stocking stuffer book of math problems for XMas. Had just glanced it over but then I saw this one. It was composed by Sam Loyd, a very famous 19th century puzzle & chess master.
What I like about it is there's a eureka moment that has nothing to do w/setting up multi-variable equations, or esoteric knowledge. Not real tough, but fun. Here goes.
Two ferrys travel across a river all day. The two piers are directly across from each other, and the ferrys always leave at exactly the same time and keep constant speeds.
On one trip they pass each other 720 yards from Pier A. On the trip back they pass each other 400 yards from Pier B. How wide is the river?
|
01-28-2005, 05:07 AM
Threaded Mode