Give a quick stream of consciousness before answering the following question. One copy machine can make 25 copies a minute, and a second copy machine makes 35 copies a minute. If the two copiers work together, how long would it take them to make 4,800 copies?
Options:
(A) 30 minutes
(B) 40 minutes
(C) 60 minutes
(D) 70 minutes
(E) 80 minutes
Total work done by both machines in a minute = 25 + 35 = 60 copies
Total number of copies required = 6000
Time = 4800/60 = 80 mins
The answer: (E).