Question : In one hour, a boat goes 12 km along the stream and 8 km against the stream. What is the speed of the boat in still water (in km/hr)?
Option 1: 8
Option 2: 12
Option 3: 10
Option 4: 9
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Correct Answer: 10
Solution :
Given, a boat goes 12 km along the stream and 8 km against the stream in an hour.
So, the speed of the boat along the stream, $s_1$ = 12 km/hr
And, the speed of the boat against the stream, $s_2$ = 8 km/hr
Now, the Speed of the boat
= $\frac{1}{2}(s_1 + s_2)$
= $\frac{1}{2}(12+8)$
= $10$ km/hr
Hence, the correct answer is 10.
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