A (speed record) can be constituted-of-or-filled-with some km.
A (rail network) can be constituted-of-or-filled-with some km.
A (space rocket) may crash after reaching an altitude of some km.
Some km can be constituted-of-or-filled-with (rail transit lines).
Some (km northeast) can be constituted-of-or-filled-with (capital dhaka).