Clare baked cookies for Mac. Ten minutes after taking the cookies of the oven and letting them stand in a room, she measured the temperature to be 90°C. After another ten minutes,  the temperature was 55°C. Then after 10 minutes, she again measured the temperature to be 37.5°C. What was the temperature in the oven?  What was the temperature in the room?  How long will it take for the cookies to reach 28°C since it was taken out of the oven?