A farm manager would like to make a decision on a diesel tractor selection using the rotovator for soil tillage and weed control operation under 3 ha area. The engine power category of the tractors are 20-40 hp (15-30 kW) for Tractor A, and 80-100 hp (60-75 kW) for Tractor B. Optimum rotational speed of power take-off (PTO) is 540 revolution per minit (rpm), and the torque is 450 Nm at the engine rated speed of 2000 rpm. The width of the rotavator equipment is 1500 mm, and the effective width is 95 percent of actual width. Average effective field capacity (EFC) recorded was 1.40 ha/hr and the implement field efficiency is at 85%.

1. Calculate the average tractor's speed to operate the boom sprayer at the rated EFC. (3 marks)
2. Calculate the total estimated time (in minutes) required to complete the tillage operation for 3 ha area? (5 mark)
3. If the estimated power at PTO was 14% less than indicated power, and drawbar power was 86% of the PTO power, calculate the minimum PTO power required (in kW or Hp). (6 marks)