Imagine Magazine - Johns Hopkins - January/February 2015 - (Page 47)

knossos games by Tim Boester Fish Ladder Diadromous fish migrate from the sea to fresh water in order to spawn. When the migration route has been blocked (due to a manmade dam or other barrier), structures called fish ladders can be constructed to help the fish complete their journey. Design a fish ladder for the following site. You have one 3', two 4', and three 5' columns available to you. In this puzzle, you will design a fish ladder using large, pre-cast columns. These steel-reinforced concrete columns can be stacked one on top of another if necessary, but cannot be cut. In the completed ladder, the water level must step down in one-foot increments. (The horizontal lines on the figure and in the columns indicate these one-foot increments.) The columns can only be inserted at the locations marked by the dots. You may not need to use all of the columns provided. Because there is a two-foot difference between the water levels at the highest and lowest barriers, you must add one barrier to break that drop into one-foot steps. Depending on whether you had a column of height three, four, or five feet, you would use one of these solutions: x1 x 1x x2 2 x3 x3 Solution to Knossos Games 22.2 Begin Day 1 13:30 Land in Amsterdam Day 1 17:00 - 23:00 Train to Berlin Day 2 15:00 - 21:00 Train to Munich Day 3 16:00 - 23:00 Train to Budapest Day 4-5 23:00 - 19:30 Train to Milan Day 6 14:00 - 22:00 Train to Marseille Day 6-7 08:00 - 18:00 Train to Madrid Day 7-8 10:00 - 20:00 Train to Marseille Day 8 07:00 - 10:30 Train to Paris Day 9-10 10:00 - 14:00 Train to Amsterdam End Day 10 13:30 Flight home Tim Boester is an educational psychologist who studies how people learn math. He has more puzzles available at www.knossosgames.com. www.cty.jhu.edu/imagine imagine 47 http://www.knossosgames.com http://www.cty.jhu.edu/imagine

Table of Contents for the Digital Edition of Imagine Magazine - Johns Hopkins - January/February 2015

Big Picture
In My Own Words
Land & Sea
Going Full Circle with Ocean Conservation
At Home in the Water
Diving into Marine Science
Ocean Views
Becoming a Steward of the Seas
Engineering for Ocean Health
Selected Opportunities and Resources
The Wonderful World of MOOCs
Super
Off the Shelf
Word Wise
Exploring Career Options
One Step Ahead
Planning Ahead for College
Students Review: UC San Diego
Creative Minds Imagine
Mark Your Calendar
Knossos Games

Imagine Magazine - Johns Hopkins - January/February 2015

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