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A man takes 4 hours to row a boat 16 km downstream of a river and 2 hours to cover a distance of 6 km upstream. Find the speed of the river current in km/hr.1). 1 km/hr2). 2 km/hr3). 2.8 km/hr4). 1.3 km/hr |
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Answer» Let the speed of the current be X and the man’s speed be y km/hr. Distance = speed × time 16 = (x + y) × 4 ⇒ x + y = 4 ----(1) ⇒ -x + y = 3 ----(2) Adding (1) and (2) ⇒ 2Y = 7 ⇒ y = 3.5 From (1) ⇒ x = 4 – 3.5 = 0.5 km/hr |
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