On the Nav Computer: Put 445 (km) on inner main scale next to the km-m-ltr index, go to Naut.m. index and read groundspeed in knots; 240 kts.  

Put 60 (minutes) on inner main scale next to 240 (kts) on outer main scale, go to 180 (minutes) on inner main scale and read distance travelled on outer scale; 720nm.  

720nm due South = 720 minutes of latitude = 12šLatitude.  

If aircraft started at 10šN and travelled South for 12š Latitude it would be at 02šS.