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Sunday Times Teaser 2749 – Round the River

by Robin Nayler

Published: 31 May 2015 (link)

My school holds “Round the river” runs — a whole number of metres to a bridge on the river and then the same number of metres back. Some years ago I took part with my friends Roy, Al, David and Cy. We each did the outward half at our own steady speeds (each being a whole number of centimetres per minute). For the return half I continued at my steady speed, Roy increased his speed by 10%, Al increased his speed by 20%, David increased his by 30%, and Cy increased his by 40%. We all finished together in a whole number of minutes, a little less than half an hour.

What (in metres) is the total length of the race?

3 Comments Leave one →
  1. Brian Gladman permalink

    This gives the output:

  2. Teaser Beaver permalink

    How would you run this in Python to get the answer?

  3. Brian Gladman permalink

    You can run Python code by installing a Python interpreter on your computer. The most popular free Python interpreter is available here.

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