Doppler Cents Puzzler

[Mark Schecter]

Oops, I guess I shoulda showed it to myself first. Now methinks it's 
6.25 mph.

(This is a perfect example of how I did in math class!)

-Mark Schecter

PS How many guesses do I get?  8-)

Mark Schecter wrote:
> 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
>>
>