A dog barks 30 times per minute.  If 2 dogs bark 30 times per minute, how many times will they have barked after 10 minutes?
There are 2 dogs and they each bark 30 times per minute so together they bark 2*30 = <<2*30=60>>60 times per minute
2 dogs bark a combined total of 60 times per minutes, after 10 minutes they will have barked 60*10 = <<60*10=600>>600 times
#### 600