Question : A man rows upstream 36 km and downstream 48 km taking 6 hours each time. The speed of the current is:
Option 1: 0.5 km/hr
Option 2: 2 km/hr
Option 3: 1 km/hr
Option 4: 1.5 km/hr
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Correct Answer: 1 km/hr
Solution : Given: A man rows upstream 36 km and downstream 48 km, taking 6 hours each time. The speed of the current = $\frac{1}{2}\times (\text{rate of downstream}-\text{rate of upstream})$. The rate of upstream is given as $\frac{36}{6}=6$ km/hr The rate of downstream is given as $\frac{48}{6}=8$ km/hr So, the speed of current = $\frac{1}{2}\times(8–6)=\frac{1}{2}\times 2$ = 1 km/hr Hence, the correct answer is 1 km/hr.
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