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Middle school math word problem... please help me

If Machine A makes a yo-yo every five minutes and Machine B takes ten minutes to make a yo-yo, how many hours would it take them working together to make 20yo−yos?

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Mark M. | Mathematics Teacher - NCLB Highly QualifiedMathematics Teacher - NCLB Highly Qualif...
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A makes 12 every hour
B makes 6 every hour
 
h represents the number of hours
 
12h + 6h = 20
18h = 20
 
Can you solve for h and answer?