Question 1181800
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<pre>

All we need to do is to substitute the given frequencies into equation


    239 = {{{256*(761/(761 + v))}}}.



To solve it, cross multiply, simplify and find v


    239(761 + v) = 256*761


    761 + v = {{{(256*761)/239}}} = 815.1 mph


          v                       = 815.1 - 761 = 54.1 mph.


<U>ANSWER</U>.  The speed of the car is 54.1 miles per hour  (rounded as requested).
</pre>

Solved.


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