WIS Math Fair 2018
A murder occurred and the victim’s corpse was found at the time of 9:40pm. After the corpse was discovered, they immediately measured the temperature of the corpse. The thermometer showed that the temperature of the body was 35 Celsius. We know that the temperature in the room with a constant temperature of 20 Celsius. After 80 minutes, at 11:00pm, the corpse’s temperature had dropped to 32 Celsius. What time was the victim killed?