Each of the four sons can cross the bridge in time, namely 3, 7, 13, and 17 minutes, respectively, Only two people can cross at a time, What is the minimum time in which all four can cross the bridge?
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Math
Answer:
Each of the four sons can cross the bridge in time, namely 3, 7, 13, and 17 minutes, respectively, Only two people can cross at a time, What is the minimum time in which all four can cross the bridge 20 minutes.
