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s = 2 ( 50 +20 ) = 140 cm
t = 70sekon
v = 140/70 = 2 cm/s
brarti t buat sisi yg 20 cm :
t = s/v
t = 20/2 = 10s
kalo yg sisi 50cm :
t = s/v
t = 50/2 = 25s