A car is going eastwards with a velocity of \( 8 \mathrm{~m} / \mathrm{s} \). To the passengers ...

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A car is going eastwards with a velocity of \( 8 \mathrm{~m} / \mathrm{s} \). To the passengers in the car, a train appears to be moving north wards with a velocity of \( 15 \mathrm{~m} / \mathrm{s} \). What is the actual velocity of the train :
(A) \( 7 \mathrm{~m} / \mathrm{s} \)
(B) \( 17 \mathrm{~m} / \mathrm{s} \)
(C) \( 23 \mathrm{~m} / \mathrm{s} \)
(D) None of these
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