1.

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

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)

6 = (y - x) × 2

⇒ -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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