Question
Download Solution PDFIn 4 h, a boat goes 12 km along the stream. It covers 6 km against the stream in the same time. The speed of the boat in still water (in km/h) is:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
In 4 h, a boat goes 12 km along the stream.
It covers 6 km against the stream in the same time.
Concept:
Speed = Distance / Time
Solution:
The speed of the boat along the stream = Distance / Time = 12 km / 4 h = 3 km/h.
The speed of the boat against the stream = Distance / Time = 6 km / 4 h = 1.5 km/h.
Speed of the boat in still water = (Speed along the stream + Speed against the stream) / 2
⇒ (3 + 1.5)/2 = 2.25 km/h
Therefore, the speed of the boat in still water is 2.25 km/h.
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