(1) Statement I says the length of one piece is 3.7 m. As this is more than half of the total length, this piece would be the longest one. According to statement II, 0.9 + x +x + 1.5 = 7, x = 2.3 m. So, the longest piece will be 2.3 + 1.5 = 3.8 m. So, either of the two statements alone is sufficient to answer the problem.