14. The speed of sound of the whistle is\\
(A) $340 \mathrm {~m} / \mathrm { s }$ for passengers in A and $310 \mathrm {~m} / \mathrm { s }$ for passengers in B\\
(B) $360 \mathrm {~m} / \mathrm { s }$ for passengers in A and $310 \mathrm {~m} / \mathrm { s }$ for passengers in B\\
(C) $310 \mathrm {~m} / \mathrm { s }$ for passengers in A and $360 \mathrm {~m} / \mathrm { s }$ for passengers in B\\
(D) $340 \mathrm {~m} / \mathrm { s }$ for passengers in both the trains\\
Answer

\begin{figure}[h]
\begin{center}
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\caption{(A)}
\end{center}
\end{figure}

\begin{figure}[h]
\begin{center}
  \includegraphics[alt={},max width=\textwidth]{e79946a0-735d-438d-ac42-5265ab72284d-07_76_76_459_459}
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\caption{(B)}
\end{center}
\end{figure}

\begin{figure}[h]
\begin{center}
  \includegraphics[alt={},max width=\textwidth]{e79946a0-735d-438d-ac42-5265ab72284d-07_76_72_459_575}
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\caption{(C)}
\end{center}
\end{figure}

\begin{figure}[h]
\begin{center}
  \includegraphics[alt={},max width=\textwidth]{e79946a0-735d-438d-ac42-5265ab72284d-07_76_72_459_691}
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\caption{(D)}
\end{center}
\end{figure}

\begin{enumerate}
  \setcounter{enumi}{14}
  \item The distribution of the sound intensity of the whistle as observed by the passengers in $\operatorname { train } \mathrm { A }$ is best represented by
\end{enumerate}

\begin{figure}[h]
\begin{center}
\captionsetup{labelformat=empty}
\caption{(A)}
  \includegraphics[alt={},max width=\textwidth]{e79946a0-735d-438d-ac42-5265ab72284d-07_209_484_782_369}
\end{center}
\end{figure}

\begin{figure}[h]
\begin{center}
\captionsetup{labelformat=empty}
\caption{(B)}
  \includegraphics[alt={},max width=\textwidth]{e79946a0-735d-438d-ac42-5265ab72284d-07_212_484_777_1078}
\end{center}
\end{figure}

\begin{figure}[h]
\begin{center}
\captionsetup{labelformat=empty}
\caption{(C)}
  \includegraphics[alt={},max width=\textwidth]{e79946a0-735d-438d-ac42-5265ab72284d-07_214_484_1026_369}
\end{center}
\end{figure}

\begin{figure}[h]
\begin{center}
\captionsetup{labelformat=empty}
\caption{(D)}
  \includegraphics[alt={},max width=\textwidth]{e79946a0-735d-438d-ac42-5265ab72284d-07_216_489_1024_1082}
\end{center}
\end{figure}

Answer

(A)

\begin{figure}[h]
\begin{center}
  \includegraphics[alt={},max width=\textwidth]{e79946a0-735d-438d-ac42-5265ab72284d-07_76_76_1319_468}
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\caption{(B)}
\end{center}
\end{figure}

\begin{figure}[h]
\begin{center}
  \includegraphics[alt={},max width=\textwidth]{e79946a0-735d-438d-ac42-5265ab72284d-07_76_75_1319_592}
\captionsetup{labelformat=empty}
\caption{(C)}
\end{center}
\end{figure}

◯

(D)\\