Discussion
A man can swim at 3 km/hr in still water. If the stream flows at 2 km/hr, how long will he take to swim to a place 10 km upstream and back ?
Answer: C
Correct answer: 12 hours
\[\text{Upstream speed} = 3 - 2 = 1 \text{ km/hr}, \qquad \text{Downstream speed} = 3 + 2 = 5 \text{ km/hr}\]
\[\text{Total time} = \frac{10}{1} + \frac{10}{5} = 10 + 2 = 12 \text{ hours}\]
Almost the whole journey is spent on the upstream leg, because the swimmer barely outpaces the current.
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