hey there,
1:
Payload = Total displacement - light ship weight - provisions (fuel, lube oil, food,...) - ballast water
2:
Distance travelled: 3200 nm
Avg. speed: 12 kts = 12 nm/h
--> Time en route: 3200 nm/(12 kts * 24 h) = 11.11111 d.
Was this your homework buddy?