If the speed of a boat in still water is 7 km/hr and its speed against the stream is 2.5 km/hr, then what is its speed in the direction of the current?
Correct Answer: Option D
Speed of boat in still water = 7 km/hr
Let speed of stream = s km/hr
Then speed of boat upstream = 7 – s km/hr
And speed of boat downstream = 7 + s km/hr
Given that
7 – s = 2.5
Solving the equation, we get b = 4.5 km/hr
Hence, speed of stream = 4.5 km/hr
Speed of boat in the direction of stream = 7 + 4.5 km/hr = 11.5 km/hr
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