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 1500 widgets?	Choose the correct option:
A) 2 hour and 20 minutes  B) 2 hour and 24 minutes  C) 2 hour and 30 minutes  D) 2 hour and 36 minutes  E) 2 hour and 40 minutes
(350+250)t=1500   600t=1500   t=5/2   t=2 hour and 30 minutes   Answer: 2 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 1500 widgets?