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Ship A is sailing towards north-east with velocity j ˆ 50 i ˆ 30 v + = → km/hr where i ˆ points east and j ˆ , 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

Correct answer: 2.6 hrs

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