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A man rows to a place 48 km distinct and come back in 14 hrs. He finds that he can row 4 km with the stream in the same time as 3 km against the stream. The rate of the stream is: a) 1 km/hr b) 1.5 km/hr c) 1.8 km/hr d) 3.5 km/hr |
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Answer» Correct option: a) 1 km/hr Explanation: Suppose he moves 4 km downstream in x hrs. Then speed downstream = (4/x) km ph; and speed upstream =(3/x) km ph (48/(4/x))+(48/(3/x)) =14 therefore x= ½ Speed upstream= 6 km ph, speed downstream =8 km ph Rate of the stream=1/2*(8-6) = 1 km ph |
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