During a chemical reaction,the temperature in the beaker decreased every minute by the same number of degrees. The temperature was 16C at 11: By 11:

During a chemical reaction,the temperature in the beaker decreased every minute by the same number of degrees. The temperature was 16°C at 11:08 A.M. By 11:43 A.M., the temperature had dropped to-17°C. By how many degrees did it drop each minute?