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For a man walking towards east with a ve...

For a man walking towards east with a velocity of "5km/hr" rain appears to fall vertically down.When the man begins to walk towards west with a velocity of "3km/hr" the rain appears to fall at an angle of `60^(0)`to the vertical.The magnitude of velocity of the rain when the man stops walking is `sqrt((139)/(N))` .Then N is equal to

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