Happy Fourth of July Math Puzzle

Fourth of JulyOur town is planning a sensational Fourth of July fireworks.  The professionals in charge of the fireworks display will light four Rockets every minute,  two Sonic Booms every 30 seconds, one Super Rocket every three minutes, and one Flying Star Fountain every 5 minutes.  The entire fireworks display will last 15 minutes. How many fireworks will they need to light?

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