Machine A can make 350 widgets in 1 hour, and machine B can make 250 widgets in 1 hour. If both machines work together, how much time will it take them to make a total of 800 widgets?  Choose the most appropriate option.
A) 1 hour and 20 minutes	B) 1 hour and 24 minutes	C) 1 hour and 30 minutes	D) 1 hour and 36 minutes	E) 1 hour and 40 minutes
(350+250)t=800   600t=800   t=4/3   t=1 hour and 20 minutes   1 hour and 20 minutesnswer: 1 hour and 20 minutes
<result>A</result>
Machine A can make 350 widgets in 1 hour, and machine B can make 250 widgets in 1 hour. If both machines work together, how much time will it take them to make a total of 800 widgets?