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. Each of the questions below consists of a question and two statements numbered I and II given below it. You have to decide whether the data provided in the statements are sufficient to answer the question. Read both the statements and give answer –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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