Speed of the boat in still water is 6 km/hr and speed of the current is 9km/hr. It takes 3 hours more in upstream than in downstream. Then it's distance is
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Speed of the Boat in still water = 6 kmph.
Speed of the Current = 9 kmph
Speed of the Boat Downstream = 6 + 9 = 15 kmph.
Speed of the Boat Upstream = 9 - 6 = 3 kmph.
Let Distance was x km.
x/3 - x/15 = 3
(5 - 1)x/15 = 3
4x = 3 * 15
x = 45/4 km.
Distance = 45/4 km.