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Verified answer
Lp = 2La + LsLa = 2 x1/2 x a x t
=3 x4
=12
Ls = s1xt + s2xt + s3xt
=3x9 + 4x9 + 5x9
=27 + 36 + 45
=108
Lp = La + Ls
=108 + 12 = 120
maaf kalau salah :)