Duration: 4:07

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A train moves in north direction with a speed of 54
\( \mathrm{P} \) \( \mathrm{km} / \mathrm{h} \). A monkey is running on the roof of the train,

W against its motion with a velocity of \( 18 \mathrm{~km} / \mathrm{h} \) with respect to train. The velocity of monkey as observed by a man standing on the ground is:
(1) \( 5 \mathrm{~m} / \mathrm{s} \) due south
(2) \( 25 \mathrm{~m} / \mathrm{s} \) due south
(3) \( 10 \mathrm{~m} / \mathrm{s} \) due south
(4) \( 10 \mathrm{~m} / \mathrm{s} \) due north
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