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A man rows a boat 18 km in 4 hour down stream and returns upstream in 12 hours. The speed of the stream in km/hr is

A1

B1.5

C2

D1.75

Answer:

B. 1.5

Read Explanation:

down stream = 18/4 = 9/2km/hr

upstream = 18/12 = 3/2

Speed of stream = Rate down stream-Rate upstream/2

=(9/2 - 3/2)/2

= 6/4

= 3/2 = 1.5 km/hr


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