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Jarak ditempuh bus + Jarak ditempuh kereta =
((2X -10) x 1/2) + ((2X+10) x 2 ) =
X - 5 + 4X + 20 =
5X+15
b. 5X + 15 = 140
5X = 140 - 15
5X = 125
X = 25
c. Bus = 2X-10
= 2x25 - 10
= 40
Kereta = 2X+10
= 2 x 25 + 10
= 60