Australia's new prime minister has a little over a year in which to resurrect the government's fortunes, having ousted his predecessor in a late night ballot of his party's MPs. His task from day one is to fix an economy battered by the economic slowdown in China.Former cabinet minister Malcolm Turnbull, 60, emerged the victor yesterday after challenging Tony Abbott, 57, for the Liberal Party leadership, capping weeks of speculation that another Australian prime minister was about to be ousted by his own ranks.With an election due by next year the former Goldman Sachs Group executive must turn around the government's poor ratings, caused by missteps by the combative Abbott.Although he enjoys strong public support, Turnbull might struggle to reunite his party after a vote in which nearly half the MPs wanted Abbott to stay, and with some senior ministers expected to quit.Turnbull is Australia's sixth prime minister in eight years. He will name his cabinet next week.Abbott had continued to defy popular opinion inside and outside his party. Despite promising to be more consultative, he blocked his MPs from supporting same-sex marriage and announced a greenhouse-gases emissions reduction target criticised as inadequate by environmental groups.He agreed last week to take in 12000 Syrian refugees but the news was overshadowed by rumours of a cabinet reshuffle and an politically incorrect remark by Immigration Minister Peter Dutton about climate change. ..