Question

8. The temperature of a place at 6 p.m. is 12°C above zero. If it decreases at the rate of 2°C per hour
till 6 a.m., the next day, at what time would the temperature be 2°C below zero? What will be the
temperature at 6 a.m.?
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Answer 1

Answer:

Ncert solutions

Grade 7

Mathematics

Science

Chapters in NCERT Solutions - Mathematics, Class 7

Exercises in Integers

Question 5

Q5) The temperature at 12 noon was 10°C above zero. If it decreases at the rate of 2°C per hour until midnight, at what time would the temperature be 8°C below zero? What would be the temperature at mid-night?

Every hour temperature decrease by 2\degree C2°C

Therefore the temperature decrease 2\degree C2°C = 1 hour

So the temperature decrease 1\degree C1°C = \frac{1}{2}\ hour

2

1

hour

So the temperature at 18\degree C18°C = \frac{1}{2}\times18\ \ =\ 9\ hours\

2

1

×18 = 9 hours

Total time = 12 hours + 9 hours

= 21 hours

= 9 pm

thus, at 9pm the temperature would be 8\degree C\ below\ 0\degree C8°C below 0°C

Step-by-step explanation:

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