A man sitting in a bus travelling in a direction from west to east with a speed of 40 km/h observes that the rain-drops are falling vertically down. To the another man standing on ground the rain will appear
(1) To fall vertically down
(2) To fall at an angle going from south to east
(3) To fall at an angle going from east to west
(4) The information given is insufficient to decide the direction of rain.
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