Math so confused please help?

Question

In a bottling company, a machine can fill a 2-liter (L)

bottle in 0.5 second (s) and move the next bottle into place in 0.1 s. How many

2-L bottles can be filled by the machine in 2 h?

Answer 1

Convert 2 hours to seconds : 2 hr • 60 min/hr  Ã¢Â€Â¢ 60 sec/min =7200 sec

Then add 0.5 + 0.1 = 0.6 for each bottle so divide 7200 by 0.6 getting 12000 bottles

Answer 2

2h = 7200 seconds

7200/(0.5+0.1) = 12000 bottles