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Can you solve this problem in your head?
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September 26th, 2011
This is a neat little problem that I came across. When looked at the right way, it requires just some simple arithmetic and no algebra.
Two ferries traveling across a river at constant speeds meet 700 feet from one of the river banks. They continue to the opposite end, turn around and meet again 400 feet from the opposite river bank. How wide is the river?
If you feel you need a hint, you can go to 13Decoder to decode the following:
Pbafvqre gur fhz bs gur qvfgnaprf geniryrq ol gur gjb obngf. Jung vf gur fhz bs gurve geniry qvfgnaprf jura gurl zrrg gur svefg gvzr naq jung vf gur fhz bs gurve qvfgnaprf jura gurl zrrg gur frpbaq gvzr?
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