$[-/3$ Points$]$

DETAILS

As shown below, the red train is stationary and the green train is moving forward at a speed of $31\frac{m}{s}.$ Between the trains is a bicyclist moving forward at $14\mathrm{.}4\frac{m}{s}.$ Each train has a whistle with a frequency of $298$ Hz $.$ The air temperature is $10C.$

A$.)$ What is the frequency from the red train's whistle as heard by the bicyclist?

$q,$

B$.)$ What is the frequency from the green train's whistle as heard by the bicyclist?

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