Doppler Cents Puzzler

[Mark Schecter]

Right about 12.5 mph, meguesses.

-Mark Schecter

PS Do I have to show my work? It's kind of convoluted ...

Robert Scott wrote:
> 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
>