P can complete a work in 12 days working 8 hours a day. Q can complete the same work in 8 days working 10 hours a day. If both P and Q work together, working 8 hours a day, in how many days can they complete the work?
Choose the correct answer.
A) 5  B) 5 3/5  C) 5 5/7  D) 6  E) None
P can complete the work in (12 x 8) hrs. = 96 hrs.   Q can complete the work in (8 x 10) hrs. = 80 hrs.   P's1 hour's work =	1	and Q's 1 hour's work =	1	.   96	80   (P + Q)'s 1 hour's work = 1	+	1 =	11	.   96	80	480   So, both P and Q will finish the work in 480 hrs.   11   Number of days of 8 hours each = 480	x	1 =	60	days = 5	5	days.   11	8	11	11   Option 5 5/7
<result>C</result>
P can complete a work in 12 days working 8 hours a day. Q can complete the same work in 8 days working 10 hours a day. If both P and Q work together, working 8 hours a day, in how many days can they complete the work?