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Quantum CyberTeaser: July/August 1998


B238

Ahoy, matey! A raft and a motorboat left town A simultaneously and traveled downstream to town B. (The raft always moves at the same speed as the current, which is constant.) The motorboat arrived at town B, immediately turned back, and encountered the raft two hours after they had set out from A. How much time did it take the motorboat to go from A to B? (Assume that it travels at a constant rate of speed.)

Solution

Vroooooom!

The winners:

  • Alex Wissner-Gross (New Hyde Park, New York)
  • Natalia Toro (Boulder, Colorado)
  • Leo Borovskiy (Brooklyn, New York)
  • Jaak Sarv (Tallinn, Estonia)
  • Bruno Konder (Rio de Janeiro, Brazil)
  • Jim Grady (Branchburg, New Jersey)
  • John Beam (Bellaire, Texas)
  • Melania Drozdzewicz (Thornton, Colorado)
  • Theo Koupelis (Wausau, Wisconsin)
  • Quek Dingeng (Singapore)

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