The temperature at 12 noon at a certain place was above zero

MATHEMATICS · Numerical · GCSE · Mathematics · Ratio and Proportion · Ratio and Proportion

Problem

The temperature at 12 noon at a certain place was 18∘18^\circ above zero. If it decreases at the rate of 3∘3^\circ per hour, at what time will it be 12∘12^\circ below zero?

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