A diesel tractor rated at $50$ kW consumes $0.25$ L kWh⁻¹ at full load. When pulling a plough it operates at $70$% of its rated power for $4$ hours. Diesel costs ₦180 per litre. (i) Calculate the total fuel used and its cost. (ii) If the plough covers $12$ ha in that time, find the average fuel cost per hectare. (iii) A newer tractor of the same power consumes only $0.20$ L kWh⁻¹ at the same load. Determine the percentage reduction in fuel cost per hectare when the newer tractor is used.

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Fuel used: 35 L; total cost: ₦6 300; cost per hectare: ₦525. With the newer tractor cost per hectare falls to ₦420, a 20 % reduction.

Gce Model Questions Vol1 2025 Agricultural Science Question 7

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