In Kashmir, the temperature at 5:00 pm is $10^{o} C$ and the temperature decreases by $2^{o} C / h o u r$ . At what what time does the objects start to freeze if the objects freeze below $0^{o} C$ ?

After 9:00 pm

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After 10:00 pm

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After 12:00 pm

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After 6:00 pm

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Solution

The correct option is B After 10:00 pm
At 5:00 pm, temperature = $10^{o} C$
Given that the temperature decreases by $2^{o} C / h o u r$ .

At 6:00 pm,
Temperature = $10 - 2 = 8^{o} C$

At 7:00 pm,
Temperature = $8 - 2 = 6^{o} C$

At 8:00 pm,
Temperature = $6 - 2 = 4^{o} C$

At 9:00 pm,
Temperature = $4 - 2 = 2^{o} C$

At 10:00 pm,
Temperature = $2 - 2 = 0^{o} C$

So, objects start to freeze after 10:00 pm as the temperature reaches $0^{o} C$ at 10:00 pm.

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In Kashmir, the temperature at 5:00 pm is 10oC and the temperature decreases by 2oC/hour. At what what time does the objects start to freeze if the objects freeze below 0oC?

In Kashmir, the temperature at 5:00 pm is $10^{o} C$ and the temperature decreases by $2^{o} C / h o u r$ . At what what time does the objects start to freeze if the objects freeze below $0^{o} C$ ?