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.
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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