Question
Three planks of different lengths, G, H and J are nailed together to make a frame as shown. Plank G has 3 holes which divide it into 4 equal parts. Plank H has 4 holes which divide it into 5 equal parts and Plank J has 5 holes which divide it into 6 equal parts. In the frame, the holes N, P and Q are three corners of an equilateral triangle. Plank G is 216 cm long. What is the total length of Plank G, Plank H and Plank J?
3 m

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Three planks of different lengths, G, H and J are nailed together to make a frame as shown. Plank G has 3 holes which divide it into 4 equal parts. Plank H has 4 holes which divide it into 5 equal parts and Plank J has 5 holes which divide it into 6 equal parts. In the frame, the holes N, P and Q are three corners of an equilateral triangle. Plank G is 216 cm long. What is the total length of Plank G, Plank H and Plank J?