Water at temperature 100^@C cools in 10 ...

Water at temperature `100^@C` cools in 10 minutes to `80^@C` in a room of temperature `25^@C`. Find (i) The temperature of water after 20 minutes (ii) The time when the temperature is `40^@C` [Given: `(log)_e(11)/(15)=-0. 3101 ,log5=1. 6094` ]

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