Question

A metallic rod was heated to 300•c and left for cooling. After every 2minutes it becomes colder by 15•c. What will be the temperature of the rod after half an hour.?

Answer 1

Answer:

The temperature after 30 mins  = 25°C

Step-by-step explanation:

Let the temperature after 30 mins = y°C = 300 -x

Half an hour = 30 mins

If in 2 minutes the temperature decrease = 15°C

Let temperature decrease in 30mins  = x°C

According to the question:-

So,

Minutes ∝ temperature decrease

2*x = 30*15

=> x = 15*15

=> x = 225°C

So,

The temperature decrease = 225°C

So,

The temperature after 30 mins = 300 -225 = 25°C

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Answer 2

Answer:

425°c

Step-by-step explanation:

This is the temperature after half an hour