Two identical machines have the ability to produce both nuts and bolts. However, it takes 3 second to produce a bolt but 1 seconds to produce a nut. What is the fastest the two machines, working together, can produce 1,000 nuts and 1,000 bolts? Choose the correct choice from the following answers.
A) 1,250 seconds	B) 1,500 seconds	C) 1,750 seconds	D) 2,000 seconds	E) 3,000 seconds
To minimize the amount of time, we should make both machines work all the time while producing 1,000 nuts and 1,000 bolts.   Two machines to produce 1,000 bolts will need (1,000*3)/2 = 1500 seconds.   Two machines to produce 1,000 nuts will need (1,000*1)/2 = 500 seconds.   Total = 1500 + 500= 
<gadget id="calculator">1500 + 500</gadget>
<output>2_000</output>
2000.   Answer: 2,000 seconds
<result>D</result>
Two identical machines have the ability to produce both nuts and bolts. However, it takes 3 second to produce a bolt but 1 seconds to produce a nut. What is the fastest the two machines, working together, can produce 1,000 nuts and 1,000 bolts?