Question
What is the speed of the stream? I. The boat
covers a distance of 54 km in 3 hours while running downstream. II. The boat covers the same distance in 6 hours while running upstream.Solution
We know that speed = Distance/Time From statement I: Downstream speed = 54/3 = 18 km/hr Upstream speed = 54/6 = 9 km/hr Speed of stream = 1/2 × (Downstream - upstream speed) => 1/2 × (18 - 9) = 4.5 km/hr Therefore, both the statements are necessary to answer the question.
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