KinematicsEasy
Question
A boat which has speed of 5 km/h in still water across a river of width 1 km along the shortest possible path in 15 min. The velocity of the river water in km/h
Options
A.1
B.3
C.4
D.√41
Solution
Shortest possible path comes when absolute velocity of boatman comes perpendicular to the river current as shown in figure
t =
= 
∴
Solving this equation, we get vr = 3 km/h
∴ Correct answer is (b)
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