In a factory, an assembly line can manufacture 39 widgets per second. in another factory, 6 widgets are combined to make 1 whoozit. approximately how many days must the widget assembly line run to produce 3,500,000 whoozits?
a.4 days
b.6 days
c.374 days
d.9479 days

Given:
39 widgets per seconds
6 widgets to make 1 whoozit

3,500,000 whoozits * 6 widgets/whoozits = 21,000,000 widgets
21,000,000 widgets / 39 widgets/sec = 538,461.54 seconds

1 day = 24 hours
1 hour = 60 minutes
1 minutes = 60 seconds
1 hour = 3600 seconds

3,600 seconds * 24 hrs = 86,400 seconds 
538,461.54 seconds / 86,400 seconds per day = 6.23 days.

B. 6 days.