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

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