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Current revision as of 15:06, 10 November 2014
Two ferry boats sail back and forth across a river, each traveling at a constant speed, and turning back without any loss of time. They leave opposite shores at the same instant, pass for the first time 700 feet from one shore, continue on their way to the banks, return and pass for the second time 400 feet from the opposite shore. What is the width of the river?
Can you solve this without writing down any equations?
Problem by Alberto L Delgado, from the now extinct Bradley Problem of the Week.