Question

two partical A&B move with constant velocity s v1 & v2 along two mutually perpendicular straight line towards the intersection point O.At moment t =0, the partical were located at distance l1 &l2 from O , respectively.Find the time , where they are nearest and also the shortest distance between them.

Answer 1

Let l be the distance covered by the boat  A along the river as well as by the boat B across the river. Let v0 be the stream velocity and v' the velocity of each boat with respect to water. Therefore time is taken by the boat A in its journey


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