Working at their respective constant rates, machine A makes 100 copies in 10 minutes and machine B makes 150 copies in 15 minutes. If these machines work simultaneously at their respective rates for 30 minutes, what is the total number of copies that they will produce? Answers:	A) 250	B) 600	C) 675	D) 700	E) 750
Machine A can produce 100 *30/10= 
<gadget id="calculator">100 *30/10</gadget>
<output>300</output>
300 copies   And, Machine B can produce   150* 30/15= 
<gadget id="calculator">  150* 30/15</gadget>
<output>300</output>
300 Copies   Total producing 600 Copies.   600 is the answer
<result>B</result>
Working at their respective constant rates, machine A makes 100 copies in 10 minutes and machine B makes 150 copies in 15 minutes. If these machines work simultaneously at their respective rates for 30 minutes, what is the total number of copies that they will produce?