A person aiming to reach exactly opposite point on the bank of a stream is swimming with a speed of 0.5 m/s at an angle of 120 degree with the direction of the flow of the water. The speed of water in the stream is
(1)0.25 m/s
(2)0.5 m/s
(3)1.0 m/s
(4)0.433 m/s
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