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Lingtasan turun : a = 15.,r = 2/3 maka S = a/(1-r) = 15/(1-2/53) = 15/(1/3) = 45lintasan naik : a = 15(2/3) = 10,r = 2/3 maka S = 10/(1-2/3) = 10/(1/3) = 30
panjang lintasan total 45 + 30 = 75 m (c)