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Message: <blockquote data-quote="»[Brain]«»[Waves]«1" data-source="post: 2752468" data-attributes="member: 918749">Let the velocity of the boat be v km/h and velocity of the current be u km/h.When the boat goes in still water, its velocity is v=6 km/h.When the boat goes against the current, its velocity is v-u=(6-u) km/h.For distance S, time taken in still water to cover the distance = S/6 seconds.For same distance S, time taken while going against the current = S/(6-u) seconds.According to given, S/(6-u) = 3*(S/6)=> 1/(6-u) = 1/2=> 6-u = 2=> u=4 km/h.So, the speed of the current is 4 km/h.</blockquote>