Farmer A has three fields: Field A ($2.4$ ha, light soil), Field B ($1.8$ ha, heavy soil) and Field C ($2.0$ ha, medium soil). A plough covers $0.8$ ha h⁻¹ on light soil; on heavy soil its rate falls by 25 % and on medium soil it falls by 10 %. A disc‑harrow covers $0.9$ ha h⁻¹ on heavy soil but only $0.6$ ha h⁻¹ on light or medium soil.\n\n(i) Calculate the total time required to work all three fields if the plough is used on every field.\n(ii) Calculate the total time if the disc‑harrow is used on the heavy‑soil field while the plough is used on the other two fields.\n(iii) State which strategy is faster and by how much time.

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Plough only: 8.78 h; disc‑harrow strategy: 7.78 h; disc‑harrow strategy is faster by 1.00 h.

Gce Model Questions Vol1 2018 Agricultural Science Question 11

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