How Many Tennis Balls Can A Tennis Ball Machine Launch in an Hour?

Question:

At this rate, how many tennis balls can it launch in an hour?

Answer:

300 tennis balls

Explanation:

There are 60 minutes in an hour so...
60/12 = 5
Since 60 tennis balls can be launched in 12 minutes and 12x5 is one hour, 60x5 tennis balls can be launched in an hour.
60(5) = 300

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