F1 gearboxes...spur or helical gears?

Question: I was asked at University during an interview why Spur gears are used in F1 cars rather than Helical...the only answer I could give was that Spur gears are quieter and cheaper, but this wouldnt really matter to F1 teams, so I didnt know what else to say. Does anyone know the answer?

Answer: Spur gears are stronger, less prone to breaking, and require less friction to actually move them, saving some more hp for the rear wheels.

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