The speed of a boat in still water is 8 km/hr. If it speed downstream be 15 km/hr, then speed of the stream is:
Speed of the boat downstream = 15 km/hr.
Speed of the boat in still water = 8 km/hr
Let the speed of the stream = y km/hr.
We have, 15 = 8 + y
y = 15 – 8 = 7 km/hr.
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