To the man walking towards east with a speed of 4km/h the wind appears to blow from North . It appears to blow from North-East when he doubles his speed the absolute velocity and direction of the wind will be
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AD is actual direction of wind when the person is still .BD is direction of wind when the person moves at 4 km/he and CD when he moves at 8 km/hr
=> AD= root AB^2+BD^2
=root 4^2+4^2
=4root 2km/hr
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