Ship A is sailing towards north-east with velocity vector v = 30 i + 50 j km/hr where i points east and j , north. Ship B is at a distance of 80 km east and 150 km north of Ship A and is sailing towards west at 10 km/hr. A will be at minimum distance from B in -
(1) 4.2 hrs (2) 2.2 hrs (3) 2.6 hrs (4) 3.2 hrs
