Monday, November 08, 2010

Fishing for Bobbers

You can paddle your canoe seven miles per hour through any placid lake. The stream flows at three miles per hour. The moment you start to paddle up stream a fisherman looses one of his bobbers in the water fourteen miles up stream of you.

How many hours does it take for you and the bobber to meet?


  1. My 11 year old daughter and I think it will take 2 hours for the bobber and canoe to meet.

  2. I think that it would be determined by which way the stream is moving, maybe?

  3. 4 hours. The 7 mph becomes 4 mph once you subtract the stream current.

  4. Violet and Ms McNeilly/Mrs Salazar and her 11 year old daughter have it right, it will take 2 hours.

    I believe traveling upstream means you are traveling against the current anonymous.

    It takes two hours, as the bobber travels at 3 mph, it will be six miles closer to you in two hours. Assuming you don't tire out, in two hours you will have traveled (7-3)*2 = 8 miles. That puts you next to the bobber.


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