Answer: 2.05 hours
Step-by-step explanation: There are 60 seconds in a minute, and 60 minutes in an hour. To find the seconds in an hour, multiply 60 by 60.
60 x 60 = 3600
There are 3600 seconds in an hour. Divide 7380 by 3600 to find the number of hours.
7380/3600 = 2.05
The reaction took 2.05 hours.