A liquid cools from `50^(@)C` to `45^(@)C` in 5 minutes and from `45^(@)C` to `41.5^(@)C` in the next 5 minutes. The temperature of the surrounding is

Hot water cools from 60^(@)C to 50^(@)C in the first 10 minutes and to 45^(@)C in the next 10 minutes. The temperature of the surroundings is:

Certain quantity of water cools from 70^(@)C to 60^(@)C in the first 5 minutes and to 54^(@)C in the next 5 minutes. The temperature of the surrounding is

Certain quantity of water cools from 70^(@)C to 60^(@)C in the first 5 minutes and to 54^(@)C in the next 5 minutes. The temperature of the surrounding is

Certain quantity of water cools from 70^(@)C to 60^(@)C in the first 5 minutes and to 54^(@)C in the next 5 minutes. The temperature of the surrounding is

Certain quantity of water cools from 70^(@)C to 60^(@)C in the first 5 minutes and to 54^(@)C in the next 5 minutes. The temperature of the surroundings is

Hot water cools from 60^(@)C to 50^(@)C in the first 10 minutes and to 42^(@)C in the next 10 minutes Then the temperature of the surrounding is

A body cools from 50^(@)C to 46^(@)C in 5 minutes and to 40^(@)C in the next 10 minutes. The surrounding temperature is :

A body cools from 70^(@)C" to "60^(@)C in 5 minutes and to 45^(@)C in the next 10 minutes. Calculate the temperature of the surroundings.