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Two ships A and B are sailing straight ...

Two ships `A and B` are sailing straight awayfrom a fixed point `O` along routes such that `angleAOB` is always `120^@`. At a certain instance, `0.4=8 km, OB=6 km` and the ship `A` issailing at the rate of 20 km/hr while the ship `B` sailing at the rate of 30 km/hr, then thedistance between `A and B` is changing at therate (in km/hr): (A) `260/sqrt(37)` (B) `260/37` (C) `80/37`

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