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 900 widgets?
Pick one:
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=900   600t=900   t=3/2   t=1 hour and 30 minutes   Answer: 1 hour and 30 minutes
<result>C</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 900 widgets?