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= 1/(1-2/3)
= 1/1/3
= 3 m
lintasan turun = a/1-r
a = 1 x 2/3
= 2/3
= 2/3/(1-2/3)
= (2/3)/(1/3)
= 2 m
lintasan total = 3 + 2
= 5 m