Two trains are moving with equal speed in opposite directions along two parallel railway tracks....

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Two trains are moving with equal speed in opposite directions along two parallel railway tracks. If the wind is blowing with speed \( u \) along the track so that the relative velocities of the trains with respect to the wind are in the ratio \( 1: 2 \), then the speed of each train must be
(a) \( 3 u \)
(b) \( 2 u \)
(c) \( 5 u \)
(d) \( 4 u \)
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