Bece Model Questions Vol1 2025 Mathematics Question 7

Practice essay / theory question 7 from the 2025 Bece Model Questions Vol1 Mathematics examination. This question covers Rates .

Bece Model Questions Vol1 2025 Mathematics Essay / Theory
Topic: Rates
Question 7 BECE_MODEL_QUESTIONS_VOL1 • 2025 • MATHEMATICS • essay

A water tank in a school can hold 12,000 litres. Two electric pumps, Pump A and Pump B, are used to fill the tank. Pump A can fill the tank alone in 8 hours, while Pump B can fill it alone in 12 hours. Both pumps are switched on together, but after 3 hours Pump B develops a fault and stops working. The electricity cost is ₦15 per kilowatt‑hour, and Pump A consumes 0.75 kW while operating, whereas Pump B consumes 0.5 kW while operating.

Question Parts

( a )
Determine the total time required to fill the tank completely.
( b )
Calculate the total electricity cost incurred in filling the tank.
( c )
If the school wants to reduce the total cost by 20 % without changing the pumps, suggest one practical change and justify how it achieves the reduction.

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About This Question

This is Bece Model Questions Vol1 2025 Mathematics Question 7. It is one of the essay questions from the 2025 Bece Model Questions Vol1 Mathematics examination.

The question covers Rates .

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