Man \( A \) sitting in a car moving with \( 54 \mathrm{~km} / \mathrm{hr} \) observes another \(...

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Man \( A \) sitting in a car moving with \( 54 \mathrm{~km} / \mathrm{hr} \) observes another \( \operatorname{man} B \) in front of car crossing perpendicularly the road of width \( 15 \mathrm{~min} 3 \mathrm{~s}: \)
(A) Speed of \( \operatorname{man} B \) is \( 5 \sqrt{10} \mathrm{~m} / \mathrm{s} \)
(B) Speed of \( \operatorname{man} B \) is \( 5 \mathrm{~ms}^{-1} \)
(C) Actual direction of motion of \( B \) is at an angle of \( \tan ^{-1}\left(\frac{1}{3}\right) \) with direction of motion of car
(D) Actual direction of motion of \( B \) is at an angle of \( \tan ^{-1}(3) \) with direction opposite to the direction of motion of car
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