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 isA1B1.5C2D1.75Answer: B. 1.5 Read Explanation: down stream = 18/4 = 9/2km/hrupstream = 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 Read more in App