Mini questions on NCA Q # 3

There a sentence in question that : A qualified surveyor has valued the land and buildings at 31 March 2009 at 180 $ Million. My qusetion is how shoul I spread this revaluation between building and land? Here is the full quetsion: Draft financial statements extracts as at 31 March, 2009. Property at valuation Land 20,000 Buildings 165,000 Plant 180,500 Investments at fair value through profit and loss at 31 March, 2008 12,500 The non-current assets have not been depreciated for the year ended 31 March 2009. Dexon has a policy of revaluing its land and buildings at the end of each accounting year. The values in the above statement of financial position are as at 1 April 2008 when the buildings had a remaining life of fifteen years. A qualified surveyor has valued the land and buildings at 31 March 2009 at $180 million. Plant is depreciated at 20% on the reducing balance basis. The investments at fair value through profit and loss are held in a fund whose value changes directly in proportion to a specified market index. At 1 April 2008 the relevant index was 1,200 and at 31 March 2009 it was 1,296.