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x = 120 . 4 per 6
x = 80 km
s= jp/js
= 6/12.000.000
= 1:2.000.000
jarak b->c
js = jp / s
= 4 : 1/ 2.000.000
= 4 x 2.000.000/1
= 8.000.000 cm
= 80 km