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2058 = 6.s²
s² = 2058/6
s² = 343
s = √343 (lupa hasilnya)
5.
putaran 2 = 1 jam 36 mnt 42 dtk
berakhir pkl 17.30
putaran 1+putaran2 = 3 jam
17.30 - 3 = 14.30