Discussion
A man rows 27 km with the stream and 15 km against the stream taking 4 hours each time. Find the rate at which the stream flows?
Answer: A
The stream flows at 1.5 kmph.
Downstream speed is 27/4 = 6.75 km/h and upstream speed is 15/4 = 3.75 km/h. The stream's speed is half their difference:
\[ \frac{6.75 - 3.75}{2} = 1.5\ \text{km/h} \]
The rowing speed in still water is half the sum, 5.25 km/h. Taking the full difference (3 km/h) is the usual error; 1.8, 2.2 and 2.5 do not follow.
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