9m/dtk= ....... km/mnt

1 m = 0,001 m
1 detik = 1/60 menit

9m/dtk =9*0,01 km : 1/60 menit
            =0,009 km : 1/60 menit
            =0,009 *60/1
            = 0,54 km / menit

semoga bantu yaaaa