Question

Please can someone help me with this ..i have only 10 minu

A scientist records the internal temperature of a kiln that has been turned off for maintenance after a limestone calcination reaction as 683 oC.  He then leaves the room to allow the kiln cool further. The room temperature is 19°C. An equation that models the temperature of the cooling kiln (T in oC, t in min) is as follows: 

T(t) = To0.33t/10 + 19

After how many minutes, to one decimal place, will the kiln be less than 176 oC?