Question : The effective speed of a boat is 15.2 km/h against the stream and 20.8 km/h along the stream. Find the speed of the stream.
Option 1: 18 km/h
Option 2: 1.8 km/h
Option 3: 2.8 km/h
Option 4: 4.3 km/h
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Correct Answer: 2.8 km/h
Solution : Speed of stream $= \frac{\text{Speed along the stream - Speed against the stream}}{2}$ $ = \frac{20.8 - 15.2}{2}$ $ = \frac{5.6}{2}$ $ = 2.8$ km/h Hence, the correct answer is 2.8 km/h.
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