Solution: Take a taxi to xkm, because the starting price within 5km is 5 yuan, so the remaining (x-5)km is charged at 1.2 yuan per kilometer.

According to the meaning, 5+1.2 (x-5) =11.

1.2(x-5)=6

x-5=5

x= 10

A: The taxi has gone 10km.