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1). 10 m/hr2). 5 m/hr3). 12 m/hr4). 6 m/hr |
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Answer» Let the speed of current be x m/hr. Speed of boat in still water = 60 m/hr Speed of boat travelling upstream = (60 - x) m/hr Time TAKEN to travel 10 m upstream = 10/(60 - x) hr Speed of boat travelling downstream = (60 + x) m/hr Time taken to travel 15 m downstream = 15/(60 + x) hr = 10/(60 - x) hr (GIVEN) ⇒ 900 - 15x = 600 + 10x ⇒ 25X = 300 ⇒ x = 12 m/hr ∴ Speed of current is 12 m/hr |
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