A level field of 1.2 ha $(120 \mathrm{~m} \times 100 \mathrm{~m})$ is ploughed using a reversible mould board plough with a total effective cutting width of $0.64 \mathrm{~m}$. The average field overlap is $80 \mathrm{~mm}$ between two consecutive laps. The average time taken for each turn is 30 seconds and the mean operating speed is $5.0 \mathrm{~km} \mathrm{~h}^{-1}$. The maximum effective field capacity in ha $\mathrm{h}^{-1}$ is
(A) 0.207
(B) 0.236
(C) 0.283
(D) 0.318
A level field of 1.2 ha $(120 \mathrm{~m} \times 100 \mathrm{~m})$ is ploughed using a reversible mould board plough with a total effective cutting width of $0.64 \mathrm{~m}$. The average field overlap is $80 \mathrm{~mm}$ between two consecutive laps. The average time taken for each turn is 30 seconds and the mean operating speed is $5.0 \mathrm{~km} \mathrm{~h}^{-1}$. The maximum effective field capacity in ha $\mathrm{h}^{-1}$ is
(A) 0.207
(B) 0.236
(C) 0.283
(D) 0.318