Respostas

2014-01-08T19:49:38-02:00
Ferrovia ~>  vou chamar de X

( 2 / 9 ) .x  + (1 / 3 ) x =  75 km 
                                               
 ( 6 + 9 ) .x / 27 = 75

15 x = 75 . 27

x = 75 . 27 / 15

x =  5 . 27 = 135 km