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ada dua lintasan, saat turun dan naik:
turun:
Sn = a/(1-r)
= 1000/(1-(2/3))
= 3000 m
naik:
Sn = ar/(1-r)
= 1000.(2/3)/(1-(2/3))
= 2000 m
total lintasan = 3000+2000 = 5000 m