Machine A puts out a yo-yo every 6 minutes. Machine B puts out a yo-yo every 9 minutes. After how many minutes will they have produced 10 yo-yos?
Answers
A) 24 minutes  B) 32 minutes  C) 36 minutes  D) 64 minutes  E) 72 minutes
A's speed = 3 yo-yos every 18 minutes   B's speed = 2 yo-yos every 18 minutes   A + B's speed = 3 + 2= 
<gadget id="calculator">3 + 2</gadget>
<output>5</output>
5 yo-yos every 18 minutes   both together will finish 10 yo-yos in 36 minutes   correct option is 36 minutes
<result>C</result>
Machine A puts out a yo-yo every 6 minutes. Machine B puts out a yo-yo every 9 minutes. After how many minutes will they have produced 10 yo-yos?