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A quarry must supply 1.2 million tonnes of limestone a year and works 300 days. What daily output is required?

  • A.400 tonnes
  • B.40,000 tonnes
  • C.3,600 tonnes
  • D.4,000 tonnes

Answer: D

Correct answer: 4,000 tonnes

\[ \frac{1{,}200{,}000}{300} = 4000\ \mathrm{tonnes\ per\ day}. \] The quarry works fewer days than the kiln, which runs continuously, so the quarry’s daily rate must exceed the kiln’s consumption and the difference is held in the stockpile - which is one of the reasons the stockpile exists at all, alongside the blending function.

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