I was out riding my bicycle this calm quiet evening when I happened upon an ice cream truck playing music to attract customers. The truck had stopped to dispense ice cream, but the music continued. Since I always carry my ETD when I ride my bike, I quickly measured the pitch of a recurring note in the music and found it to be 10 cents sharp as I was riding straight towards the truck. Then after I passed the truck, I measured the pitch again and found it to be 10 cents flat as I was riding directly away from it. How fast was I riding my bicycle? Robert Scott Ypsilanti, MI
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