Question : A boat moves downstream at a rate of 8 km/hr and upstream at 4 km/hr. The speed of the boat in still water is:
Option 1: 4.5 km/hr
Option 2: 5 km/hr
Option 3: 6 km/hr
Option 4: 6.4 km/hr
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Correct Answer: 6 km/hr
Solution :
Given: A boat moves downstream at a rate of 8 km/hr and upstream at 4 km/hr.
We know, the speed of the boat in still water
$=\frac{\text{(Downstream speed + Upstream speed)}}{2}=\frac{(8+4)}{2}=\frac{12}{2}$ = 6 km/hr
Hence, the correct answer is 6 km/hr.
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