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a ) pada jalan yg datar x = 137/52
pada jalan yg tdk datar x = 137/22
b) x = 137/22
x = 6,23 jam
no 2)
Doni = x
anton = x + 2
x + x+2 = 30
2x + 2 = 30
2x = 28
x = 28/2
x = 14
umur doni = 14
umur anton = 16