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Question
The temperature at 12 noon at a certain place was 18° above zero. If it decreases at the rate of 3° per hour at what time if would be 12° below zero?
Options
12 midnight
12 noon
10 am
10 pm
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Solution
10 pm
Explanation;
Hint:
∵ Temperature at 12 noon = 18° above zero = +18°
Rate of decrease per hour = −3°
Temperature 12° below zero = −12°
−12 is 30 units to the left of +18°
Time at which it reach −12° = `30/3` = 10 h
10 hrs after 12 noon = 10 pm
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