Discussion
A boat takes 4 hours to travel 24 km downstream and 6 hours to return. What is the speed of the current ?
Answer: C
Correct answer: 1 km/hr
\[\text{Downstream} = \frac{24}{4} = 6 \text{ km/hr}, \qquad \text{Upstream} = \frac{24}{6} = 4 \text{ km/hr}\]
\[s = \frac{6 - 4}{2} = 1 \text{ km/hr}\]
The boat itself moves at \(\tfrac{6+4}{2} = 5\) km/hr in still water.
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