Working together, Paul and Dan pick 40 bushels of apples in 4.95 hours. Alone, it takes Dan 9 hours. How long would it take Paul
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The triangles ABC and A'B'C' are shown in the diagram below. The transformation is a reflection in the line 
. This is proved by the fact that the distance between each corner ABC to the mirror line equals to the distance between the mirror line to A'B'C'.
