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In one hour, a boat goes 11 km/h along the stream and 5 km/h against the stream. The speed of the boat in still water (in km/h) is:

1. 3 km/h
2. 5 km/h
3. 8 km/h
4. 9 km/h

Correct answer: 8 km/h

Solution

Downstream speed is 11 km/h and upstream speed is 5 km/h. The speed in still water is the average of these two speeds: \((11+5)/2=8\) km/h. So the answer is 8 km/h.

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