It takes 50 identical printing machines 8 hours to print 500,000 posters. How long would it take 40 of these machines to print the same total?  Choose the correct choice from the following:
A) 10 hr
B) 12 hr
C) 12 hr 24 min
D) 12 hr, 40 min
E) 13 hr, 20 min
50 machines finish the job in 8 hours. We do not have to take care of the 500'000 posters, it does not matter.   40 machines means, 20% less of capacity and therefore 20% longer to work for a certain job.   8 * 1.2 = 9 hr, 36 min   Answer A	..   Hi reto,   since you are looking time for 40 machines it is 25% less so will take 25% more ..   ans  8*1.25= 
<gadget id="calculator"> 8*1.25</gadget>
<output>10</output>
10 hrs..   10 hr)
<result>A</result>
It takes 50 identical printing machines 8 hours to print 500,000 posters. How long would it take 40 of these machines to print the same total?