It takes 60 identical printing machines 4 hours to print 200,000 cards. How long would it take 50 of these machines to print the same total? Pick:
A) 10 hr
B) 5 hr
C) 6 hr
D) 4 hr 30 min
E) 5 hr 12 min
50% of 60 = 40% or 0.30   4 hr x 60 min = 240 min   240 min x 0.30 = 72 min or 1 hr and 12 min   1 hr and 12 min + 4 hr = 5 hr and 12 min   Answer is 5 hr 12 min
<result>E</result>
It takes 60 identical printing machines 4 hours to print 200,000 cards. How long would it take 50 of these machines to print the same total?