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16 3 A child in danger of drowing in a river is being carried downstream...

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16 3 A child in danger of drowing in a river is being carried downstream by a current that flows uniformly at a speed of m sec The child is 600m from shore and 800m downstream of a helipad when the rescue helicopter sets out and the helicopter follows the same direction throughout the motion If the helicopter 80 proceeds at its maximum speed of m sec 3 with respect to air and air is blowing with velocity of 4m sec perpendicular to river flow velocity as shown then the time in sec taken by helicopter to reach the child Wind 4m s

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